For the following questions please pick the best answer along with a short expla

Question

For the following questions please pick the best answer along with a short explanation.

1. subduction zone and hotspots both make chains of volcanoes. You can distinguish the way these chains were created because:

A. Hotpot volcanoes are stratovolcanoes; subduction zone volcanoes are shield volcanoes

B. Hotspot volcanoes get older as you move away from the active volcano; subduction zone volcanoes in a chain are about the same age

C. Hotspot volcanoes erupt less frequently; subduction volcanoes erupt more frequently

D. Noe of these reasons can be used to distinguish the two

2. Which of the following results in divergent oceanic boundaries forming ridges (i.e. high topography)?

A. an increase in pressure

B. isostasy

C. slab pull

D. water depth and temperature

E. all of the above

3. Felsic magmas tend to form granite more often than rhyolite because

A. they have high silica

B. they have high water contents

C they are relatively low temperature

D. they crystallize in the crust as the pressure decreases on them

E. all of the above

4. In which of the following does water not play an important role?

A. creation of magmas

B. style of eruptions

C. textures of igneous rocks

D. none of the above involve water

E. all of the above (A-C) involve water

5. A porphyritic rock has a dark colored, fined grained matrix and some very large phenocrysts. The phenocrysts are most likely to be which of the following minerals?

A. Muscovites

B. K-feldspars

C. Quartz

D. Olivine

E. Pyroxene

6. What type of volcano produces (or is created by) supereruptions?

A. shield volcano

B. cinder cone

C. stratovolcano

D. caldera

E. all of the above

Explanation / Answer

For the following questions please pick the best answer along with a short explanation.

1. subduction zone and hotspots both make chains of volcanoes. You can distinguish the way these chains were created because:

A. Hotpot volcanoes are stratovolcanoes; subduction zone volcanoes are shield volcanoes

B. Hotspot volcanoes get older as you move away from the active volcano; subduction zone volcanoes in a chain are about the same age

C. Hotspot volcanoes erupt less frequently; subduction volcanoes erupt more frequently

D. Noe of these reasons can be used to distinguish the two

2. Which of the following results in divergent oceanic boundaries forming ridges (i.e. high topography)?

A. an increase in pressure

B. isostasy

C. slab pull

D. water depth and temperature

E. all of the above

3. Felsic magmas tend to form granite more often than rhyolite because

A. they have high silica

B. they have high water contents

C they are relatively low temperature

D. they crystallize in the crust as the pressure decreases on them

E. all of the above

4. one of the our big points from the beginning of class is that Earth is a water planet, and therefore water is important in most of earth's processes. In which of the following does water not play an important role?

A. creation of magmas

B. style of eruptions

C. textures of igneous rocks

D. none of the above involve water

E. all of the above (A-C) involve water

5. A porphyritic rock has a dark colored, fined grained matrix and some very large phenocrysts. The phenocrysts are most likely to be which of the following minerals?

A. Muscovites

B. K-feldspars

C. Quartz

D. Olivine

E. Pyroxene

6. What type of volcano produces (or is created by) supereruptions?

A. shield volcano

B. cinder cone

C. stratovolcano

D. caldera

E. all of the above

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