Question

what is the tree line ?

Answer 1

The tree line is the edge of the habitat at which trees are capable of growing. It is found at high elevations and in frigid environments. Beyond the tree line, trees cannot tolerate the environmental conditions (usually cold temperatures or lack of moisture).
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Answer 2

The term tree line describes the height above which trees can no longer grow in the mountains .The main reason for this is the very low temperature in these places .If we climb a mountain , we find a temperature drop of about 6° C for every kilometre .In addition the temperature fluctuations between day and night as well as summer and winter are very high .