Timberline - National Geographic Society
https://www.nationalgeographic.org/encyclopedia/timberline/
WEBOct 19, 2023 · This imaginary line on Earth is called the timberline, or the tree line. The timberline is usually a point where there isnt enough air, heat, or water to keep trees alive. Although the timberline often seems abrupt from a distance, on the ground you can observe a gradual change from big, tall trees to stumpy ones.
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