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the very gradual movement of continents across the Earth’s surface as a result of the movement of the plates that they lie on
the part of the edge of a continent that slopes gradually out into the sea and ends in a sudden steep slope in very deep water
a crack on the Earth’s surface where layers of rock have become separated from the main layer of rock and where earthquakes sometimes happen
science the part of the Earth that is deep below the surface and surrounds the core (=centre)
existing on the Earth, or happening on the Earth, instead of in the sky or sea. Things that are from other planets are extraterrestrial.
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