24 terms

Geol 101: Plate Tectonics


Terms in this set (...)

African Plate
Arabian Plate
Indian Plate
Eurasian Plate
Australian Plate
Antarctic Plate
Philippine Plate
Pacific Plate
North American Plate
Juan de Fuca Plate
Cocos Plate
Nazca Plate
Caribbean Plate
South American Plate
the rigid outer part of the earth, consisting of the crust and upper mantle
-outermost layer of the planet
-composed of a great variety of igneous, metamorphic, and sedimentary rocks
-underlain by the mantle
Continental Drift
the gradual movement of the continents across the earth's surface through geological time
Seafloor Spreading
the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side
Why was the Continental Drift Hypothesis rejected?
1. No way to move continents through oceans
2. Wegener incorrectly suggested that continents plow through ocean crust
3. Could not measure ongoing continental drift
4. Wegener thought continents moved fast
Magnetic Polar Wander
the perceived movement of the Earth's paleo-magnetic poles relative to a continent while regarding the continent being studied as fixed in position
Sea Floor Spreading Evidence
samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge
Divergent Boundary
plates move away from each other
Convergent Boundary
plates move toward each other
Transform Boundary
plates move sideways past each other