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Plate Tectonics

Across
A deep valley where two plates move apart
Soft layer of the mantle on which the lithosphere floats
A deep canyon on the ocean floor
A break or crack in the Earth's lithosphere along which rocks move or slip past each other
Down
A ridge layer made up of the uppermost part of the mantle and the crust
Layer of molten iron and nickel that surrounds the inner core of the Earth
The layer of rock that forms the Earth's outer surface