the outer layer of the Earth
the layer of the earth between the crust and the core
the central part of the Earth,
the solid part of the earth consisting of the crust and outer mantle
the gradual movement and formation of continents (as described by plate tectonics)
theory that crust and upper mantle move on plastic like layer of the mantle.
the region where two tectonic plates are in contact
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other