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Describe why volcanoes occur at location A.  Why do the rocks melt there? select all that apply A) Increased temperature in the lower mantle B) Decrease in pressure as hot rocks move up towards the surface of the earth C) Addition of water to the mantle rocks

Describe why volcanoes occur at location A.  Why do the rocks melt there? select all that apply A) Increased temperature in the lower mantle B) Decrease in pressure as hot rocks move up towards the surface of the earth C) Addition of water to the mantle rocks

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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1) Describe why volcanoes occur at location A.  Why do the rocks melt there? select all that apply

A) Increased temperature in the lower mantle
B) Decrease in pressure as hot rocks move up towards the surface of the earth
C) Addition of water to the mantle rocks
 
2) Sample 1: Predict the cooling and solidification history for the rock sample based on its texture.

A) Slow
B) Fast
C) Slow then fast
Rock 3. This brown-colored rock Rock 1. This rock is dark colored, has no visible crystals, and is not glassy. It does have many vesicles (holes) and is a vol- canic rock. A chemi- Rock 2. This light-colored rock is finely crys- talline and not glassy. It contains some fine- grained gray crystals and a few small holes. A chemical analysis documents that it is a felsic rock. It was collected on a volcano. contains large, light-colored lenses of flattened pumice in a finely crystalline matrix. Under the microscope, the matrix contains compacted volcanic ash, along with small crystals and fragments of other rocks. The crystals are mostly quartz and K-feldspar. cal analysis revealed a relatively low silica content. Rock 4. This rock is finely crystalline and lacks visible crystals. It has a dark-gray color. A chemical analysis of the sample indicates that it is a mafic rock. Rock 6. This rock 2 has very large crys- tals, some of which are 5 to 10 cm long. Most of the rock is K-feldspar and quartz, and the dark crystals are a type of amphibole that is most common in felsic rocks. 4 Rock 5. This porous rock in the center of the photograph has numerous holes and is extremely lightweight. It is light colored and is composed of vol- canic glass. There are no visible crys- tals, but the rock is likely to be felsic in composition. Rock 9. This rock contains large crys- tals of K-feldspar in a brown-colored matrix of small to medium-sized 7. 8. crystals. There is no glass, ash, or Rock 7. This medium-grained rock is a plutonic rock. It has a Rock 8. This rock has scattered visible crystals of salt-and-pepper appearance, caused by the presence of felsic amphibole and biotite in a medium-gray, finely crystal- vesicles, so the rock minerals (feldspar and quartz) and mafic minerals (mostly bio- tite mica). It is intermediate in composition. line matrix. It reportedly was collected either on a vol- is probably not a cano or from dikes exposed near a volcano. volcanic rock.
Transcribed Image Text:Rock 3. This brown-colored rock Rock 1. This rock is dark colored, has no visible crystals, and is not glassy. It does have many vesicles (holes) and is a vol- canic rock. A chemi- Rock 2. This light-colored rock is finely crys- talline and not glassy. It contains some fine- grained gray crystals and a few small holes. A chemical analysis documents that it is a felsic rock. It was collected on a volcano. contains large, light-colored lenses of flattened pumice in a finely crystalline matrix. Under the microscope, the matrix contains compacted volcanic ash, along with small crystals and fragments of other rocks. The crystals are mostly quartz and K-feldspar. cal analysis revealed a relatively low silica content. Rock 4. This rock is finely crystalline and lacks visible crystals. It has a dark-gray color. A chemical analysis of the sample indicates that it is a mafic rock. Rock 6. This rock 2 has very large crys- tals, some of which are 5 to 10 cm long. Most of the rock is K-feldspar and quartz, and the dark crystals are a type of amphibole that is most common in felsic rocks. 4 Rock 5. This porous rock in the center of the photograph has numerous holes and is extremely lightweight. It is light colored and is composed of vol- canic glass. There are no visible crys- tals, but the rock is likely to be felsic in composition. Rock 9. This rock contains large crys- tals of K-feldspar in a brown-colored matrix of small to medium-sized 7. 8. crystals. There is no glass, ash, or Rock 7. This medium-grained rock is a plutonic rock. It has a Rock 8. This rock has scattered visible crystals of salt-and-pepper appearance, caused by the presence of felsic amphibole and biotite in a medium-gray, finely crystal- vesicles, so the rock minerals (feldspar and quartz) and mafic minerals (mostly bio- tite mica). It is intermediate in composition. line matrix. It reportedly was collected either on a vol- is probably not a cano or from dikes exposed near a volcano. volcanic rock.
Site D: A continental magmatic arc, where volcanoes are on top of a mountain belt nearthe edge ofthe continent. The volcanoes erupt light- colored and gray volcanic rocks. Older intrusive rocks, some with coarse crystals, are also exposed. [Samples 5,6, and 7] Site A: A line of volcanic islands and submarine mountains. Broadvolcanoes on the islands are foming dark volcanic rocks. [Sample 1]. Site E: An island arc, Site B: Circular volcanic depressions (calderas) on land, which are filled with light-colored volcanic ash and light-colored volcanic rocks. which is a chain of volcanic islands adjacent to an ocearic trench. The volcanoes erupt gray volcanic ash andlava flows. There are also some [Samples 2 and 3] intrusive rocks. [Samples 8 and 9] Site C: A mid-oceanridge that zigzags across the ocean floor. The rock sample is dark colored andis from a lumpy lava flow on the seafloor. [Sample 4]
Transcribed Image Text:Site D: A continental magmatic arc, where volcanoes are on top of a mountain belt nearthe edge ofthe continent. The volcanoes erupt light- colored and gray volcanic rocks. Older intrusive rocks, some with coarse crystals, are also exposed. [Samples 5,6, and 7] Site A: A line of volcanic islands and submarine mountains. Broadvolcanoes on the islands are foming dark volcanic rocks. [Sample 1]. Site E: An island arc, Site B: Circular volcanic depressions (calderas) on land, which are filled with light-colored volcanic ash and light-colored volcanic rocks. which is a chain of volcanic islands adjacent to an ocearic trench. The volcanoes erupt gray volcanic ash andlava flows. There are also some [Samples 2 and 3] intrusive rocks. [Samples 8 and 9] Site C: A mid-oceanridge that zigzags across the ocean floor. The rock sample is dark colored andis from a lumpy lava flow on the seafloor. [Sample 4]
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