ch 13 earth science
Terms
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- lithosphere
- the crust and the uppermost portion of the mantle
- ring of fire
- surrounds the entire Pacific Ocean
- continental drift
- theory that Africa and South America had once been part of a larger continent that had broken and moved apart
- converging boundary
- two plates come together; e.g Pacific Plate and the North American Plate
- Alfred Wegener
- proposed the continental drift theory
- cause of plate movement
- think-skinned thrusting and terranes
- asthenosphere
- the layer of the mantle that is under the lithosphere
- diverging boundary
- two plates move apart; e.g Nazca Plate and the Pacific Plate
- spreading centers
- areas where lithospheric plates are moving apart
- fault
- a break or crack in Earth's crust along which movement has occurred
- collision boundary
- the converging plates are carrying continents; the plates collide and the continents weld into a single continent; e.g Himalayan Mountains
- Pangea
- large supercontinent that broke apart
- plate tectonics
- the study of the formation and movement of plates
- subduction boundary
- form of converging boundary that occurs when one plate plunges down under another overriding plate; e.g Pacific Plate is subducting under the Phillippine Plate