The theory known as plate tectonics holds that Earth's crustal layer consists of plates that float on a layer of molten rock.

Name: The theory known as plate tectonics holds that Earth's crustal layer consists of plates that float on a layer of molten rock.
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Plate tectonics theory explains that the Earth's lithosphere (crust and upper mantle) is divided into several plates that float and move on the asthenosphere, a layer of partially molten rock beneath them.

The Theory Known as Plate Tectonics Holds That Earth's Crustal