Earth Science Quiz #2

When two plates press together, one effect is that a mountain can form. Which of the following statements provide evidence for this claim?

• When two dense oceanic plates come together, the plate that is older and more dense will subduct below the other plate.

• When dense oceanic crust comes together with a less dense continental crust, the more dense crust subducts into the continental crust.

• Even though plate material is hard, it can still be bent and folded over a long period of time, like when two towels are pushed together.

• The Appalachian Mts. are one of the oldest mountains in the United States.

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 Two of Earth’s plates pressed together for many millions of years. What happened if they pressed together in a place where oceanic plate material meets continental plate material? 

• The continental plate material was pushed downward.

• The oceanic plate material was pushed downward.

• The plates were not able to move while they were pressing together and no plate material was pushed upward.

• The edges of the plates were not pushed upward but they were broken into small pieces.

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Use the diagram to answer the following questions.

3. What plate motion is happening at point A?  

• A convergent boundary where two plates collide.

• A divergent boundary where two plates pull apart.

• A transform boundary where two plates slide past each other.

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4. What plate motion is happening at point B? 

• A convergent boundary where two plates collide.

• A divergent boundary where two plates pull apart.

• A transform boundary where two plates slide past each other.

• Not enough information is given to be able to identify the plate motion.

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5. If scientists discovered a new planet very much like Earth, where would you predict that planet would have the greatest concentration of volcanoes?  

• On its tectonic plates.

• In its oceans.

• On the edges of its continents in higher elevations.

• In the middle of its continents.

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6. What is one way that volcanoes formed?

• Volcanoes are formed when large continents get so thick that the pressure on the mantle below causes rock to melt and rise to the surface to form a volcano.

• Sometimes volcanoes form when a stationary magma plume (called a hotspot) deep in the Earth releases magma and it rises through the surface to form a volcano. The plate eventually moves, taking the now dormant volcano with it while the hot spot continues to erupt to form a new volcano.

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