Unit 3 Exam Review Geology

_________ ____ was a hypothesis proposed by Alfred Wegener, where Pangaea broke apart roughly ~200 Ma and shifted to the current position.

• Pangea

• Continental Drift

• Seafloor Spreading

• None of these answers are correct.

What was the evidence that supported continental drift hypothesis?

• Fit of the continents

• Distribution of climate belts (Glacier and Swamp)

• Distribution of fossils

• Matching geological units and mountain ranges

True or false?

The reason why continental drift was initially discarded was because it didn't provide a valid mechanism.

• True

• False

Who developed the concept of seafloor spreading?

• Alfred Wegener

• Harry Hess

True or false?

According to the concept of seafloor spreading, old seafloor is subducted at deep-sea trenches.

• True

• False

What theory states that the lithosphere is broken into a series of plates that move relative to each other?

Those plates move over underlying asthenosphere.

• Pangea

• Seafloor Spreading

• Plate Tectonics

• None of these answers are correct

The ________ is Earth's rigid outer shell.

• Asthenosphere

• Lithosphere

• Thermosphere

• None of these answers are correct

What sphere contains the hotter and weaker rocks of the mantle?

• Lithosphere

• Asthenosphere

• Thermosphere

• None of these answers are correct

True or false?

The asthenosphere is located ABOVE the lithosphere.

• True

• False

What sphere of the Earth allows for gradual motion and slow flow?

• Asthenosphere

• Lithosphere

• Thermosphere

• None of these answers are correct