Question

mountains have played important role in history

Answer 1

Answer:

Mountain environments cover some 27% of the world's land surface, and directly support the 22% of the world's people who live within mountain regions. Mountains provide for the freshwater needs of more than half of humanity, and are, in effect, the water towers of the world.

Answer 2

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Mountain environments cover some 27% of the world's land surface, and directly support the 22% of the world's people who live within mountain regions. ... Mountains provide for the freshwater needs of more than half of humanity, and are, in effect, the water towers of the world.