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As two plates drift closer to each other, the intervening oceanic crust is "destroyed" by subduction. When the two continents come into contact, neither one will subduct beneath the other, because of their densities. Instead of one plate subducting into the earth's mantle (as seen when continental crust collides with denser oceanic crust), their collision leads to the formation of very high mountains with trapped slivers of oceanic sediment forming part of the highest peaks. This happened in well-known mountain ranges, such as the Alps in Europe and the Himalayas in Asia, where fossilized marine animals are found on peaks like Mount Everest (see figure 4).

Figure 4 as taken from "The Story of Earth and Life". See references: 2.