What do you call the layers present on earth’s crust which are in constant motion?
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lithosphere that float over the asthenosphere.
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The Earth's crust is broken into many pieces. These pieces are called plates. There are twelve main plates on the Earth's surface.
The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called the Lithosphere . The layer below the rigid lithosphere is a zone of asphalt-like consistancy called the Asthenosphere . The asthenosphere is the part of the mantle that flows and moves the plates of the Earth.
Earth's crust is generally divided into older, thicker continental crust and younger, denser oceanic crust.
The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
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