21. Which of the following features is associated with a convergent boundary? A.

Question

21. Which of the following features is associated with a convergent boundary?

A. The Mississippi River

B. The Grand Canyon

C. Mt St Helens

D. Death Valley

E. Michigan Stadium

22. What type of magma erupts at divergent boundaries?

A. Andesite

B. Basalt

C. Rhyolite

D. Sandstone

E. Quartz

23. Which of the following are NOT usually associated with subduction zones?

A. Trenches

B. Island arcs

C. Back arc basins

D. Accretionary prisms

E. Continental Rifts

24. Why does the elevation of the crust decrease away from mid-ocean ridges?

A. Because volcanism increases

B. Because of diffusion

C. Because the crust cools and becomes thicker and more dense

D. Because the amount of water increases

E. Sediment deposited on top of it weighs it down

25. Which direction does the Benioff zone descend from the trench into the mantle?

A. Towards the volcanic arc

B. Away from the volcanic arc

C. A and B

D. None of the above

E. Toward the poles

26. How does water contribute to magmatism at convergent boundaries?

A. It lowers the melting point of the mantle wedge above the subducting plate

B. It decreases pressure on the sediment pile

C. It drives back-arc spreading

D. It causes earthquakes, fracturing and magma flow

E. None of the Above

27. Which direction is the Pacific Plate moving in the vicinity of Los Angeles?

A. NE

B. NW

C. SW

D. N

E. S

28. What are the dominant forces at divergent boundaries?

A. Extension

B. Ridge push

C. Lateral Shear

D. A and C

E. None of the above

29. Where do back arc basins form?

A. Ocean-continent convergence subduction zones

B. Continent-continent collisions

C. Transform faults

D. Ocean-ocean convergence subduction zones

E. None of the Above

30. What is a typical rate of plate motion?

A. 1 micron/year

B. 1 mm/year

C. 1 cm/year

D. 1 m/year

E. 1 km/yr

Explanation / Answer

21) Mt St Helens. convergent boundaies are those where two plates collide with each other forming folded mountains.

22) Basalt. as the oceanic crust is mainly mafic, melting of oceanic crust will result in the formation of basic rocks like basalt

23) Continental Rifts.

24) Because the crust cools and becomes thicker and more dense

25) Towards the volcanic arc

26)It lowers the melting point of the mantle wedge above the subducting plate

27)

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