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Theory of Plate Tectonics

Across
A deep valley where two plates move apart
A break or crack in the earth's lithosphere along which rocks move or slip past each other
A soft layer of the mantle on which the lithosphere floats
The layer of rock that forms the Earth's outer surface
Down
A rigid layer made up of the uppermost part of the mantle and the crust
Thickest layer of the Earth; it consists of two layers -the lithosphere and the asthenosphere
A deep canyon on the ocean floor