1) Climate
Found on
https://www.crosswordclues.com/clue/tree-line
The tree line is the edge of the habitat at which trees are capable of growing. Beyond the tree line, trees cannot tolerate the environmental conditions (usually cold temperatures or lack of moisture).{rp|51} The tree line should not be confused with a lower timberline or forest line, which is often defined as the line where trees form a forest wi...
Found on
http://en.wikipedia.org/wiki/Tree_line
(Timber Line) The farthest limit, either in altitude on a mountain, or the farthest north in the northern hemisphere, in which trees are able to grow. Beyond this line, the environment is too harsh for trees to survive.
Found on
http://www.americantrails.org/
The altitude at which trees stop growing on a mountain. In the U.S., the tree line floats between 8,000 and 10,000 ft, while in Europe it tends to be lower; closer to 7,000 ft.
Found on
http://www.skis.com/Glossary-of-Ski-Terms/article-12-18-2012,default,pg.htm
Elevation on a mountain above which trees cannot grow
Found on
https://sciencetrek.org/sciencetrek/topics/mountain_goats/glossary.cfm
The elevation in a mountainous region above which trees do not grow or the northern (or southern) latitude beyond which trees do not grow; also called
Found on
https://www.encyclo.co.uk/local/22222
No exact match found.
