22.17. Evolution of Plate Tectonic Theory

Try these first

1. 1.

   What is the concept of Pangaea?

   Hint

   Think about what Wegener proposed.

2. 2.

   Identify one key piece of evidence supporting seafloor spreading.

   Hint

   Consider geographical features of the ocean floor.

3. 3.

   What theory suggests that continents were once joined together?

   • Plate Tectonics
   • Continental Drift
   • Seafloor Spreading

   Hint

   Remember the name of the theory.

4. 4.

   True or False: Mid-ocean ridges are evidence for seafloor spreading.

   • True
   • False

   Hint

   Think about how ocean floors are formed.

5. 5.

   Discuss the implications of seafloor spreading on the concept of continental drift. How do they support each other?

   Hint

   Think about how what's happening under the sea relates to the surface world.

6. 6.

   Critique Wegener's theories and discuss how subsequent discoveries addressed his initial proposals.

   Hint

   Focus on the advancements in technology and methodology that clarified the theories.