Plate Tectonics Review

How did fossils show that the continents were once joined together?

• Animal fossils such as the mesosaurus were found on one continent.

• Scientists found examples of different kinds of fossils on some continents.

• Plant fossils of the same kind of fernlike plants were found on five continents.

• Freshwater animal fossils were found in the nearby oceans.

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Which of the following statements are true about sea-floor spreading? Choose the three statements that apply.

• Young rock forms in layers on the ocean floor as spreading occurs.

• Magma flows through cracks in Earth's crust and hardens.

• Continental crust is formed by the ridges as they grow.

• Mid-ocean ridges are the sources of the spreading.

• Older rock is farther away from the mid-ocean ridges.

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The sinking of ocean crust back into the mantle when it meets continental crust is 

• divergent boundaries

• convergence

• subduction  

• sea-floor spreading

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 How do convection currents drive the motion of Earth’s plates?

• Ocean water rises as it warms and falls as it cools to move the plates.

• Hot melted rock rises and cooler rock sinks in the mantle, forming currents that move the plates.

• Melted rock rises and falls, and the currents move the mantle while the crust remains in place.

• The crust moves in a current to drive the motion of the water in the oceans.

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 Read each word or phrase that describes ocean crust or continental crust. Which TWO describe OCEAN CRUST?

• dense

• thicker

• under water

• lighter

 Read each word or phrase that describes ocean crust or continental crust. Which TWO describe CONTINENTAL crust?

• dense

• thicker

• under water

• lighter

What determines how the plates interact at their boundaries?

• the materials the plates are made of

• the difference in thickness of the plates

• the kind of plates they are and whether they keep moving

• the kind of boundary and the directions in which the plates are moving

At a convergent boundary, water may be trapped and may mix with the material in the mantle. What occurs if this material reaches the surface before cooling?

• a major earthquake

• a volcano

• a tsunami

• a folded mountain

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What is one cause for the formation of a shield volcano?

• earthquake

• caldera

• hotspot

• lava plateau

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The movement of Earth’s tectonic plates generates tremendous force. Which force pulls on Earth’s crust, stretching the rock to make it thinner?

• compression

• shearing

• stress

• tension