Quote:
Originally Posted by The North One
Why are there no trees or foliage on Boise's mountains?
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High-desert climate. Boise only gets about 12 inches of precipitation a year.
There are trees and shrubs in those hills, though. Here's a better image that shows where the treeline begins:
Basically, from those trees represent the start of the forest that stretches north into Canada. Boise just happens to be where the forest and desert meet.
The Atlas Mountains are a similar example, though they are more rocky and barren than Boise's.