They drift because they are sitting on a layer of solid rock (the upper mantle or "asthenosphere") that is weak and ductile enough that it can flow very slowly under heat convection, somewhat like a liquid. Under the continents is a layer of solid rock known as the upper mantle or asthenosphere.1
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They drift because they are sitting on a layer of solid rock (the upper mantle or "asthenosphere") that is weak and ductile enough that it can flow very slowly under heat convection, somewhat like a liquid. Under the continents is a layer of solid rock known as the upper mantle or asthenosphere.1
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