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PHSC 210 Test2 Questions and Answers

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  • PHSC 210
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  • PHSC 210

PHSC 210 Test2 Questions and Answers

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  • December 28, 2024
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  • Exam (elaborations)
  • Questions & answers
  • PHSC 210
  • PHSC 210
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PHSC 210 Test2 Questions and Answers




What were Alfred Wegener's contributions? - Answer-Came up with the concept of continental drift
and named the supercontinent "pangea"



What was Wegener's evidence for continental drift? - Answer-1. "Fit of the continents"

2. matching geology and Mt. ranges

3. fossil distribution

4. living organism distribution

5. ancient climate



Why did Wegener's idea not succeed? - Answer-He had no mechanism to explain the movement of the
continents



What did the discovery of features in the ocean lead to? - Answer-The concept of seafloor spreading



What makes up the modern plate tectonics theory? - Answer-Continental drift and Seafloor spreading

, How are plate boundaries identified? - Answer-By patterns of earthquakes and volcanoes



What are 3 major types of plate boundaries? - Answer-Divergent, convergent, transform



What are the features of oceanic-oceanic convergence boundaries? - Answer-Subduction zone: oceanic-
crust plate (more dense plate) is forced down into the mantle (Ex. mariana islands, western pacific)



Features of oceanic-continental convergence? - Answer-When continental crust converges with oceanic
lithosphere the buoyant continental crust remains "floating" while the denser oceanic slab sinks into the
mantle (Ex Andes Mts, Cascade Mts)



Continental- continental convergence boundary? - Answer-No subduction zone, collision creates new
mountain ranges (Ex. Alps, Himalayas)



Features of ocean ridges and examples - Answer-zone of seafloor spreading

new ocean crust formed from magma

elevated areas of the seafloor

Mid-Atlantic Ridge, East Pacific Rise



Features and examples of continental rift valleys - Answer-continents split apart by extensional stresses

Iceland, East Africa



What are the features of the transform boundaries? - Answer-"Fracture zones"

Spreading center

Plates slide past each other along a transform fault

Near ocean ridges

Found on continents

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