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Isostasy Chpt. 4 Test is on Friday, Nov. 20 Isostasy This theory states that Earth’s lithosphere floats on a plastic-like part of the mantle (asthenosphere). Earths Crust Earth’s crust is thicker under mountains. As mountains get lifted higher, the crust becomes thicker and extends further down into the mantle. When mountains start eroding, the erosion lowers the mountain and the crust rises back up because the weight has been lifted. How old is a mountain? Rugged, tall mountains are normally younger than rounded mountains. – Why is this a sign?