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.
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The high temperatures and pressure under Earth's crust keep magma in its fluid state.
Answer:
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.
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