Ch. 4 Reading

Part of the ocean floor sinks back into the __________________ at deep ocean trenches.

• Ocean

• Mantle

• Crust

• Core

Mid ocean ridges form long chains of ______________________

that rise up from the ocean floor.

• Mountains

• Holes

• Valleys

• Islands

At which type of boundary does crust get neither created nor destroyed?

• Convergent

• Divergent

• Transform

• Techtonic

What is the image showing?

• Wegener

• Earth today

• Sea-Floor Spreading

• Pangea

Which continent or country moved the most from its position in Pangaea? It's movement also created the Himalayan mountains.

• India

• Australia

• North America

• Europe

Select the two processes that occur at a mid-ocean ridge.

• Tsunami waves transfer energy from the crust to the mantle.

• Material rises from the mantle to the crust.

• Crustal rock subducts into the mantle and melts.

• Sediments from the crust sink into the mantle.

• Thermal energy rises from the mantle to the crust.

In the Western Hemisphere, crocodiles can be found only as far north as Southern Florida. Crocodiles require warm temperatures to survive. The average annual temperature for southern Florida is 76 degrees Fahrenheit. However, crocodile fossils and fossilized subtropical plants have been found in parts of western Colorado, where the average annual temperature is 53°F.

Which statement explains why crocodile fossils are found in western regions of the United States but living crocodiles are not?

• A glacier carried crocodile bones from Mexico to Colorado.

• The climate changed, and crocodiles could not survive in this region.

• Crocodiles migrated from Florida to Colorado, where they died.

• Crocodiles used to live in cold climates but adapted to warm climates.

What is the image A showing?

• Divergent Boundary

• Convergent Boundary

• Mountain Building

• Transform Boundary

The movement shown in the map indicates that Africa's continental crust is splitting apart in the East African Rift.

As a result of this divergence, what can you predict will happen in the East African Rift region in about five million years?

• Subduction will result in more volcanic activity

• The land will become flat as the crust continues to thicken

• The sea will flood the lowlands when the rift reaches the ocean.

• The rift-basin valleys will be pushed up into a mountain range.