The continents are sliding on the crust of the earth. The crust is the outermost layer of the earth, and the crust is the part we live on. The crust is then sitting on top of the mantle. The shifting lava beneath the crust helps the continents “slide.”
There is NOT a layer of liquid “lava” upon which the continents move. Movement is the result of new crust generated at mid-ocean ridges and mechanical and density differences between layers allowing for relative movement between them. All are solid, but have variations in viscosity that allow for flouid-like flow.
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