sodium rich to potassium rich, potassium rich to argon rich, 8. divergent, ocean-ocean subduction zone, continent-continent In a porphyritic volcanic rock, which mineral grains are the last to crystallize? Well, as you can see, mankind is very good when a need arises to make simple concepts difficult to understand. The hardness of andesite rocks on the Moh scale is 7. The main difference between limestone and marble is that limestone is a sedimentary rock, typically composed of calcium carbonate fossils, and marble is a metamorphic rock. 2003-2022 Chegg Inc. All rights reserved. A K-feldspar phenocrysts in this sample. Extrusive igneous rocks are _________, whereas intrusive igneous rocks are _________. Vesicular texture, in which the rock contains many pores where gases escaped during formation. The classification of igneous rocks is based on __________. Why are andesitic rocks usually porphyritic? Volcanic glass and coarse-grained igneous rocks differ by which of the following? This rock is ___ (porphyritic andesite/ basalt/ porphyritic granite/ plagioclase) , identified by the fine groundmass surrounding large phenocrysts of ____ (orthoclase feldspar/ plagioclase feldspar) , and intermediate composition. plagioclase What is porphyritic andesite? Andesite is INTERMEDIATE in composition between MAFIC and FELSIC rocks. Duffer B1 basalts are tholeiitic and compositionally similar to the . erupted to the earth's s Why are thin sections of rocks used to study igneous rocks? Igneous Rocks Diorite is a plutonic igneous rock with intermediate composition between mafic and felsic rocks. "Black granite" is commonly seen in commercial rock, but it is not granite at all. and intermediate composition. A rhyolite porphyry at Jennings (Oneida County) has an age of 1869 +/- 6 Ma. Typical felsic rocks are granite and rhyolite (Figure 3.13). Why? The mixture of mafic and felsic minerals gives the rock a "salt and pepper" appearance. Andesite most commonly denotes fine-grained, usually porphyritic rocks; in composition these correspond roughly to the intrusive igneous rock diorite and consist essentially of andesine (a plagioclase feldspar) and one or more ferromagnesian minerals, such as pyroxene or biotite. Answer: Gabbro is a mafic intrusive igneous rock. It has an aphanitic texture, meaning its interlocking crystals cannot be seen by the naked eye. What process (or processes) can aid in generating magma from solid rock? Nam risus ante, dapibus a molestie conametm ipsum dolor siipsum dolor sit amet, consectetur adipiscing elit. What type of composition would result in a magma if equal amounts of basaltic and granitic magma were mixed? Nam risus ante, dapibus a molestie consequat, ultrices ac magna. Donec aliquet. Mafic rock, in geology, igneous rock that is . Porphyritic metadacite to porphyritic meta-andesite from the Precambrian of Egypt. What two factors determine what type of rock a magma will form? Mafic rocks include basalt, its intrusive equivalent of gabbro, and a variety of less common rock types with higher or lower contents of Na and K. Andesite and its intrusive equivalent, diorite, with slightly higher silica content, are intermediate between mafic and felsic. Fusce dui lectus,sum dolor sit amet, consectetur adipiscing elit. (Sometimes, inaccurately, this is called either granitic or rhyolitic composition.) part 1:fill in the following table from the 6 common rocks we talked about in class: (gabbro, diorite, rhyolite, andesite, granite, basalt) mafic intermediate felsic aphanitic basalt andesite rhyolite phaneritic gabbro diorite granite part 2:go to the following website and practice identifying rocks prior to completing the remainder of this Which of the following is the likely cause of a vesicular texture (open cavities in a rock)? description of an ingeous rock's composition, not its texture or Which igneous rock or magma has the lowest silica (SiO2) content? Finally, the magma_______ (erupted to the earth's surface/ remained underground), and the remaining material cooled rapidly around the phenocrysts to form the intermediate, fine-grained groundmass. Mafic. Finally, the magma Mafic rocks have low silica content (45-55%). texture of coarse grain size and is occasionally porphyritic. Donec aliquet. Diorites may be associated with either . Felsic magmas tend to be cooler than mafic magmas when crystallization begins (because they don't have to be as hot to remain liquid), and so they may start out crystallizing pyroxene (not olivine) and plagioclase. Also includes camptonitic extrusive rocks (tuff breccia, lapilli tuff, and . Darker andesite can be difficult to distinguish from basalt, but a common rule of thumb, used away from the laboratory, is that andesite has a color index less than 35. of phenocrysts 449 set in a groundmass of high crystallinity (Fig. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Chemical analyses of the most abundant components in rocks usually are presented as oxides of the elements; igneous rocks typically consist of approximately 12 major oxides totaling over 99 percent of the rock. DIORITE - phaneritic rock (large crystals) of both mafic and felsic minerals. Due to the color of the minerals forming them, the rocks are either light or dark. While the magma was cooling slowly, larger crystals can form. Andesite is considered an average igneous rock. In Bowen's Reaction Series, the chemistry of Plagioclase shifts from calcium-rich to sodium-rich as magma cools. Chalk is a soft white limestone made from the microscopic skeletons of marine plankton. The texture of such a rock is referred to as porphyritic, or more accurately porphyritic-aphanitic since it is a porphyritic andesite, and all andesites are aphanitic. They color index (M) generally range from 20 to 40. Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is . Which of the following describes best the difference between magma and lava? The earlier formed minerals will have formed slowly and remain as large crystals, whereas, sudden cooling causes the rapid crystallization of the remainder of the melt into a fine grained (aphanitic) matrix. [SE] 18 related questions found. Why are mafic rocks dark? On the basis of silica content, igneous rocks can be classified into various types. Which type of magma is most likely to quench into a natural glass? Lorem ipsum dolor sit amet, consectetur adipiscing elit. Larger scale features, such as fractures and layering, are considered rock structures in comparison. Donec aliquet. The diagram of Bowen's reaction series ( Figure 4.6) shows that differences in chemical composition correspond to differences in the types of minerals within an igneous rock. Conglomerates are clastic sedimentary rock that contains mostly pebble-size rounded clasts. as coarse-grained plutonic rocks are porphyraceous. Match the rock type with the appropriate description. Andesite ( / ndzat /) [1] is a volcanic rock of intermediate composition. The granite slabs many American homeowners have chosen for their kitchen and bathroom countertops may not be considered granite by scientists in the fields of geology, mineralogy, and petrology. The environment in which an igneous rock solidified (extrusive, intrusive or otherwise) can be inferred best by which of the following? 2. They occur throughout the sequence. This is an order showing increased silica content. First, we will construct the history of formation of the rock above (you have seen it Geology 1501 Dept of Geological Sciences Porphyritic Andesite Back to list East Carolina University Department of Geological Sciences East 5th Street Greenville, NC 27858-4353 USA 252-328-6360 | Contact Us 2021 Terms of Use Accessibility Report a Barrier Study with Quizlet and memorize flashcards containing terms like Extrusive, Felsic, Intrusive, Felsic, Intrusive/Extrusive, Intermediate and more. Andesite is the name of a family of fine-grained, extrusive igneous rocks that are usually light to dark gray in color. This shows that the large crystals had a chance to form in a magma while it was migrating and cooling. Many rhyolites consist mainly of glass, and are termed obsidian, or are partially devitrified . It is fine-grained ( aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Nam lacinia pulvinaur laoreet. Lava flows are typically finer grained than intrusive igneous rocks. [2] Phenocrysts are found in porphyritic textures where large grains are visible in volcanic extrusive rocks. Donec aliquet. 1. porphyritic andesite, basalt, porphyritic granite, Which of the following minerals crystallize early in Bowen's reaction series? However, in common use, porphyry is most often used to describe pink or red rocks with porphyritic texture. Mafic lava dominates mid-ocean ridges, while felsic lava is found mostly at convergent areas. Intermediate is a composition between felsic and mafic. The most important factor affecting the texture of an igneous rock is ________. What is the name of the process by which minerals crystallize and settle out of a melt? It usually contains roughly-equal . Nam lacinia pulvinar tortor nec facilisis. The large crystals in porphyritic rocks are referred to as phenocrysts (pheno = show, cryst = crystal), whereas the matrix of smaller crystals is called groundmass. Mafic Composition Basalt is a fine-grained mafic igneous rock. tectonic setting. Imagine hiking in Colorado when you come upon a rock with crystals, phenocrysts to be exact, the size of your fist.These phenocrysts are part of a larger porphyritic texture that grows under slow . Applications and Investigations In Earth Science, Dennis G. Tasa, Edward J. Tarbuck, Frederick K. Lutgens, Charles C. Plummer, Diane Carlson, Lisa Hammersley. dzat -d-/) is an extrusive volcanic rock of intermediate composition. Which one of the following rocks is the primary constituent of the upper layers of the oceanic crust? Explain why Venus has the hottest surface of any planet. Typical intermediate rocks are diorite and andesite (Figure 3.13). Figure 3.5.5. Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, . Diorite results from the partial melting of a mafic rock above a subduction zone. Doneat, ultrices ac, tesque dapibus efficitur laoreet. Mafic rocks include basalt, its intrusive equivalent of gabbro, and a variety of less common rock types with higher or lower contents of Na and K. Andesite and its intrusive equivalent, diorite, with slightly higher silica content, are intermediate between mafic and felsic. Andesite is an extrusive igneous rock composed primarily of plagioclase feldspar and large amounts of mafic minerals like hornblende. . They have a mineral composition that is intermediate between granite and basalt. Are square d and cutler hammer interchangeable. Click the circle by an answer with the mouse, then click on the Submit button to get a response. __________ composition lava is erupted at ocean ridges, whereas ____________ composition lava is erupted on continents. Bimodal mafic and felsic metavolcanic rocks (Early Proterozoic) at surface, covers 0.4 % of this area High-aluminum basalt to low-silica andesite pillowed flows and interlayered dacite to rhyolite tuffs and porphyries in Monico and Mountain areas, northeastern Wisconsin. Match the igneous rock texture and its appropriate description. Question 41 The theory according to which mountain masses are "floating" in the mantle material like icebergs is called. Nam risus ante, dapibus a molestie consequat, ultrices ac magna. initial melt was sourced from |[ Select ] Most magmas are dominantly molten rock (a liquid called "melt"). Is peridotite felsic or mafic? Of the oxides, silica (SiO2) is usually the most abundant. On a global basis, most of the world's magma is generated in which part of the Earth? Andesite is usually porphyritic, containing larger crystals (phenocrysts) of plagioclase formed prior to the extrusion that brought the magma to the surface . Lorem ipsum dolor sit amet, consectetur adipiscing elit. When porphyritic, it often has either olivine or plagioclase phenocrysts. What are examples of prefixes and suffixes? Nam laciniaametipsum dolor sit amet, consecng elit. feldspar is associated with [ Select ] Mafic rocks (basalt) tend to be dark black to grey in colour, intermediate rocks (andesite) tend to be a lighter grey, and felsic rocks (rhyolite) tend to be pale grey, white, cream or pale pink in colour. Which mineral would you expect to see as a, Which of the following igneous rocks exhibit aphanitic texture? This porphyritic texture indicates that the magma sat and cooled a bit below the Earth's surface, thus giving time for the large crystals to grow, before erupting onto the surface and cooling very quickly. Panels of felsic and mafic schists are found as tectonic intercalations with boninitic amphibolites in the western part of the Isua supracrustal belt. Anort. Nam lacinia pulvinar tortor nec facilisis. Pegmatite is much coarser in grain size compared to most coarse-grained igneous rocks. Pellentesque dapibus efficitur laoreet. Which of the following is characteristic of pegmatites? Fusce dui lectus, congue vel laoreet ac, dictum vitae odio. Syenite Syenite is an intrusive igneous rock consisting primarily of feldspar and mafic minerals like hornblende. Phenocrysts that make up porphyry should be felsic (quartz, feldspar). In a general sense, it is the intermediate type between silica -poor basalt and silica-rich rhyolite. What is porphyritic andesite? Which two minerals are characteristic of lower crystallization temperatures, and are absent in basalt and gabbro? [Hint]. __________ is named for a prominent, volcanic mountain range in western South. Igneous Rock Name Texture Composition 1 Pegmatite Pegmatitic Felsic 2 Pegmatite Pegmatitic Felsic 3 Pegmatite Pegmatitic Felsic 4 Gabbro Phaneritic Mafic 5 Granite Phaneritic Felsic 6 Gabbro Phaneritic Mafic 7 Diorite Phaneritic Intermediate 8 Diorite Phaneritic Intermediate 9 Granite Phaneritic Felsic 10 Granite Phaneritic Felsic 11 Syenite Phaneritic Felsic Pellentesque dapibus efametiscing elitur laoreet. According to Bowen's reaction series, which is the proper sequence of ferromagnesian silicate minerals crystallizing from a cooling magma? Andesite magma is characterized by intermediate temperatures and viscosities resulting in both passive (lava) and violent (pyroclastic) eruptive styles. Mostly porphyritic biotite granite with large microcline phenocrysts, with local fine-grained border phases and aplite. Mafic rocks/magmas are ________, whereas felsic rocks/magmas are ________. classifications. It was initially quarried during the Egyptian Ptolemaic Dynasty and was also used in the Roman Empire. An igneous rock is any crystalline or glassy roc Felsic igneous rocks are rich in silica (in the 65-75% range, meaning the rock would be 65-75% weight percent SiO 2) and poor in iron and magnesium. [Hint]. Which one of the following rock types is most likely to contain calcium-rich feldspar? and the remaining material cooled rapidly around the, Explore over 16 million step-by-step answers from our library, m ipsuongue vel laoreet ac, dictum vitae odio. Lorem ipsum dolor sit amet, consectetur adipiscing elit. It is commonly vesicular and aphanitic. Peridotite is a very dense, coarse-grained, olivine-rich, ultra- mafic . Which describes the greenhouse effect? Nam lacinia pulvinar tortor nec facilisis. It is very similar to granite, but notably almost entirely devoid of any quartz. Porphyritic basalt. Although obsidian is black-colored, it is very rich in silica and lacks crystals-which means it is lacking in minerals, thus making it a natural glass. There are nine main types of igneous rock textures: Phaneritic, vesicular, aphanitic, porphyritic, poikilitic, glassy, pyroclastic, equigranular, and spinifex. Diorites may be associated with either granite or gabbro intrusions, into which they may subtly merge. Mafic rock, in geology, igneous rock that is . The rock is majorly formed after the eruption of volcanic magma and crystallization. composition, indicating that the Download scientific diagram | Sr and Nd isotopic data from rocks of the NGP from publication: Mafic-felsic magma interactions in the Bathani volcanic-plutonic complex of Chotanagpur Granite Gneiss . Lavas 445 Porphyritic and glomeroporphyritic texture with microcrystalline to pilotaxitic 446 groundmass 447 The andesitic lavas and hypabyssal lamprophyres of andesitic composition show 448 porphyritic and glomeroporphyritic textures characterized by 30-50% (vol.) The presence of large phenocrysts suggests an initial period of ____ (rapid/ slow) cooling deep within the crust, while continuous zoning within them reveal a gradual shift in magma chemistry from_________ (sodium rich to calcium rich/ calcium rich to sodium rich/ sodium rich to potassium rich/ potassium rich to argon rich) conditions. Some felsic rocks are and some are not. What are the two star signs which make up the Tropical Circles around Earth? Donec aliquet. Pellentesque dapibus efficitur laoreet. A) granite; gabbro. They are usually dark-colored and contain iron and magnesium. The terms mafic and felsic apply to igneous rocks. ANDESITE - aphanitic rock (small crystals) of both mafic and felsic minerals. Pellentesque dapibus efficitur laoreettesque dapibus efficitur laoreet. Mafic rock is an example of Intrusive igneous rock. Andesite is a fine-grained, extrusive igneous or volcanic rock. . Obsidian has a glassy lustre and is slightly harder than window glass. Mafic rocks are darker in color than felsic rocks. Gabbro is primarily composed of minerals pyroxene, plagioclase, and small amounts of olivine (dark green) and amphibole. Experts are tested by Chegg as specialists in their subject area. Andesite is usually light to dark gray in colour, due to its content of hornblende or pyroxene minerals. A) Intrusive magma is cooler because it is well insulated by the surrounding rock. This pattern reflects significant distance the magma body would have to travel through crust in an________ (divergent/ ocean-ocean subduction zone/ continent-continent collision/ strike-slip) tectonic setting. Donec aliquet, View answer & additonal benefits from the subscription, Explore recently answered questions from the same subject, Explore documents and answered questions from similar courses. Two different crystal sizes within an igneous rock indicate that the cooling rate of the magma increased. Plagioclase and pyroxene are the normal essential minerals and plagioclase is the usually the most abundant phenocryst. Nam risu, fficitur laoreet. how to use diatomaceous earth for plants; opip health spending account; how to change nozzles on sun joe pressure washer. Since the surface of the earth is covered by oceanic and continental crustal materials, granite and basalt are very common. Name three examples of shoreline features formed by erosion. Commercial vs. Geologic Definitions of Natural Stone. [1] It is contrasted with mafic rocks, which are relatively richer in magnesium and iron. Lorem ipsum dolor sit amet, consectetur adipiscing elit. coarse- to fine-grained plagioclase porphyritic andesite and dacite. Fusce dui lectus,
ongue vel laoreet ac, dictum vitae odio. Rhyolite; Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%).Due to the high silica content, rhyolite lava is very viscous.It is often difficult to identify rhyolites without chemical analysis due to their glassy groundmasses. Andesite is a gray to black volcanic rock with between about 52 and 63 weight percent silica (SiO2). To develop a geologic time scale that is applicable to the entire Earth, rocks of similar age in different regions must be matched up. Mafic rocks include basalt, its intrusive equivalent of gabbro, and a variety of less common rock types with higher or lower contents of Na and K. Andesite and its intrusive equivalent, diorite, with slightly higher silica content, are intermediate between mafic and felsic. You will be told if your answer is correct or not and will be given some comments. Granite and rhyolite are considered felsic, while basalt and gabbro are mafic (click here for more information on mafic and felsic). Nam lacinia pulvinar tortor nec facilisis. Subaerial lava flows and breccia of porphyritic basalt, minor basaltic andesite, and rare dacite. Slate is another common metamorphic rock that forms from shale. Because of this abundance and because . Match the appropriate term associated with the production of magma to its best description. In a porphyritic texture, what is represented by the rock's "groundmass"? Porphyry is an igneous rock that contains larger crystals (phenocrysts) in a fine-grained groundmass. This reveals that the magma underwent fractionation as it moved through the crust to become more ____ (mafic/ felsic) . To a geologist, these are all anorthosite igneous rocks. Some examples are: Andesite/dacite (extrusive) and diorite/granodiorite (intrusive). How andesite is formed? 3. felsic, intermediate, mafic _________ is the dominant feldspar in basalt. Mafic lava is viscous compared to felsic lava. . An example of a mafic rock is basalt. Which of the following can account for variations in a magma/rock composition? Andesite has a mineral composition which is intermediate between granite and basalt. defined by rate of cooling: intrusive, extrusive, or plutonic. Match the following rock names with the associated rock names of the same composition, but different texture. These volcanic suites show enrichment in LIL elements (Rb, Ba, Th, U, and Pb) and depletion in Nb, P, and Ti, which can be . This type of rock contain 45 to 55 % silica content and 4 mafic igneous rocks minerals are pyroxene, amphibole, olivine, and mica. Nam risus ante, dapibus a molestie consequat, ultrices ac magna. Donec aliquet. Felsic. Anorthosite is a member of the continuous solid solution series of plagioclase feldspars, which characterize the "continuous" arm of Bowen's Reaction series (Plagioclase - Wikipedia). As defined by texture: aphanitic, porphyritic, and phaneritic. What is a likely reason for this phaneritic texture? This reveals that the magma underwent We review their content and use your feedback to keep the quality high. Why is it helpful for commissioners of regulatory commissions to have long terms? Visible quartz and potassium feldspar grains are the main constituents in a. Match the rock name with the best description. A single magma may generate several mineralogically different igneous rocks. The mixture of mafic and felsic minerals gives the rock a "salt and pepper" appearance. Andesite is usually porphyritic, containing larger crystals (phenocrysts) of plagioclase formed prior to the extrusion that brought the magma to . Which of the following rocks is likely to have the most quartz within it and why? It is actually The opposite of a 'mafic' rock i. Many rocks with an overall fine-grained texture display scattered minerals that are more than 1 mm across. Diorite has a phaneritic, often speckled, texture of coarse grain size and is occasionally porphyritic. Most commonly, black granite is in fact gabbro, a mafic intrusive igneous rock similar to basalt. Andesites contain crystals composed primarily of plagioclase feldspar and one or more of the minerals pyroxene (clinopyroxene and orthopyroxene) and lesser amounts of hornblende. Why are mafic rocks dark? 8A-8D). A. effect of gravity on temperature B. energy emitted by the Sun C. energy trapped by atmosphere D. reflection of light from a planet, Which is usually considered a division of Earth science? Nam lacinia pulvinar tortor nec facilisis. Mafic lava flows more easily than felsic lava, and the former has a lower risk of exploding. Possible answers Or small round pockets that were gas bubbles. Nam lacinia pulvinar tortor nec facilisia pulvine vel laoreet ac, dictum vitae odio. In an aphanitic rock, the colour of the groundmass, as seen on a fresh non-weathered surface, can provide clues about its mineral composition. __________ is characterized by very coarse mineral grains? What is procedural audit and advantages and disadvantages? but can exhibit a wide range of shading. Mafic igneous rocks tend to be dark in color (black, very dark brown, very dark gray, dark green-black). Andesite lavas usually have porphyritic, or vitrophyric textures, and the phenocrysts often provide a remarkable record of at least part of the evolutionary history of the rocks. In a widely accepted silica-content classification scheme, rocks with more than 65 percent silica are called felsic; those with between 55 and 65 percent silica are intermediate; those with between 45 and 55 percent silica are mafic; and those with less than 45 percent are ultramafic. Composition IGNEOUS ROCK IDENTIFICATION CHART Felsic Intermediate Mafic Ultramafic Phaneritic Granite Diorite Gabbro Peridotite Aphanitic Rhyolite Andesite Basalt Komatiite (rare) Porphyritic Rhyolite Porphyry Andesite Porphyry Basalt Porphyry Texture Vesicular Pumice Scoria Vitreous Obsidian Fragmental Tuff *. 5-15 2 phaneritic mafic basalt 3 porphyroaphanitic intermediate gabbro 4 phaneritic intermediate porphyritic andesite 5 phaneritic sialic granite 6 porphyroaphanitic sialic porphyritic rhyolite 7 glassy, vesicular sialic pumice 8 . ANDESITE Andesite is an extrusive volcanic rock with a composition that is intermediate between basalt and rhyolite. from calcium rich to sodium ~ conditions. (1) chemistry (2) geology (3) physics (4) biology, Information about sedimentary rock is useful when interpreting past environments. where it occurs. Rocks that solidify from lava flows are typically finer grained than those that crystallize intrusively. city of orange activities This pattern reflects significant distance the magma body would have to travel through Pellentesque dapibus efficitur laoreet. texture. (13.6 cm across at its widest) "Imperial Porphyry" is a beautiful, important, historically-valuable decorative stone. Figure 3.13 Examples of the igneous rocks that form from mafic, intermediate, and felsic magmas. Does andesitic magma form at subduction zones? Donec aliquet. Each kind of texture has a variety of different characteristics that make them unique. Rhyolite to andesite and closely associated sedimentary and near-surface intrusive rocks; commonly dark gray to dark greenish gray or greenish brown. Includes basalt of Cascade Head (Wells and others, 1983), Yachats Basalt (Snavely and others, 1976c) and Goble Volcanic Series (Warren and others, 1945). Lorem ipsum doFusce dui lectus, congue vel laoreet ac, dictum vitae odio. Lorem ipsum dolor sit amet, consectetur adipiscing elit. . PORPHYRITIC TEXTURE - an igneous rock in which PHENOCRYSTS (large crystals) are surrounded by a fine groundmass (very small crystals). Why? Lorem ipsum dolor sit amet, consectetur adipiscing elit. Is. In a general sense it is the intermediate type between basalt and rhyolite. The __________ of an igneous rock involves the sizes, shapes and arrangements of mineral grains. Eruptions Fusce dui lectus, congue vel laoreet ac, dictum vitae odio. What's the biggest word in the English language 'Smiles' ; there's a 'mile' between the first and last letters? collision, strike-slip, 9. erupted to the earth's surface, remained underground. Whether or not the pumice is felsic (light in color) or mafic (dark in color) depends on its chemical composition and therefore, pumice can be both felsic or mafic depending on its parental. The __________ of an igneous rock involves the mineral content, and/or refers to the magma from which it solidified. Andesite is a rock typically found in volcanoes above convergent plate boundaries between continental and oceanic plates. obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Nam risus ante, dapibus a molestie consequat, ultrices ac magna.
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