This activity is modelling how erosion of the top of a mountain range is accompanied by isostatic uplift, eventually exposing rocks, once hidden deep below. The activity is aimed at reinforcing the concept of isostasy (a state of balance in the Earth’s outer layers). It is also intended to show hat many igneous rocks become exposed at the Earth’s surface long after they have become solid rocks and are no longer flowing as magma.
Similar activities can be found on the website.
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