a relatively thin sheetlike expanse or region lying over or under another

the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum

rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium

the lower layer of the crust

the solid part of the earth consisting of the crust and outer mantle

a ridge of the earth's crust that has been forced upward between two faults and so is higher than the surrounding land

a rigid layer of the Earth's crust that is believed to drift slowly

the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum

rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium

the lower layer of the crust

the solid part of the earth consisting of the crust and outer mantle