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Alfred Wegener: Developed the first scientific theory of a supercontinent.
Asthenosphere: located beneath the lithosphere and is composed of solid, but plastic rocks.
Harry Hess: Proposed that the seafloor was spreading.
Pangaea: A supercontinent thought to have existed over 200 million years ago.
Plate boundaries: places on Earth in which two parts of the Earth interact with one another.
Plate tectonics: theory that the Earth's crust is moving as a series of large chunks as a result of continental drift and seafloor spreading.
Seafloor Spreading: theory that explains how new ocean crust is formed at mid-ocean ridges, and old oceanic crust is destroyed at ocean trenches.
Tectonic plate: large parts of the lithosphere.
Last modified: Saturday, 1 May 2010, 2:09 PM