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Altitudinal zones tend to follow a typical pattern. At the highest elevations, trees cannot grow, and whatever life may be present will be of the alpine type, resembling tundra. Below that, montane forests grow. In the temperate portions of the earth, those forests tend to be needleleaf trees, while in the tropics, they can be broadleaf trees growing in a rain forest.

The highest known permanently tolerable altitude is at 5,950 metres (19,520 ft). The summits of Mount Everest and K2 are in the death zone.