The Alps and the Himalayas are mountain ranges that were formed by geological folding. In this video we can watch the end result of the process.
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Plate tectonics is a theory dealing with the movement of plates.
Since tectonic plates can move up to 2-10 cm a year, the landscape of tectonically active regions can change quite fast on a geological timescale.
Due to the effect of both exogenic and endogenic forces, rocks constantly change. This is called the rock cycle.