Plate Tectonics and Mantle Convection

Front

Main source of downward convection movement in the mantle

Back

Slab-pull

Front

MAIN heat source for mantle convection

Back

Energy released by radioactive isotopes

Front

Causes of plate motions

Back

Convection currents

Front

Characteristic of the lithosphere that contributes to subduction

Back

The oceanic lithosphere is denser than the continental lithosphere

Front

True statement about the flow of subducted oceanic lithosphere

Back

Scientists agree that the downward flow of subducted oceanic lithosphere is equal to the upward flow of rock back towards the surface.

Front

Weaker, hotter zone beneath the lithosphere

Back

Asthenosphere

Front

Alfred Wegener is best known for this hypothesis

Back

Continental drift

Front

Evidence supporting Wegener's hypothesis

Back

Fossils of the same organism have been found on different continents.

Front

Layers of _______ found in Africa, South America, India, and Australia support the continental drift hypothesis

Back

Glacial till

Front

Name given by Wegener to the supercontinent he proposed

Back

Pangaea