Orogeny

shove india into asia with your thumb.

push the plate, raise the Himalaya, ease off and watch them erode

India has driven into Asia for fifty million years, still pushing the Himalaya up a few millimetres a year. Erosion wears the range down at the same time, every year: the skyline is the running total of both forces.

Concepts: geology, erosion.

An interactive you play with one thumb, on Wundr.