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).

At the tree line, tree growth is often sparse and stunted, with the last trees forming densely matted bushes, known as krummholtz.

The tree line, like many other natural lines (lake boundaries, for example), appears well-defined from a distance, but upon sufficiently close inspection, it is a gradual transition in most places.

Trees grow shorter towards the inhospitable climate until they simply stop growing. For this activity, we talked about what a tree line was. We then used dirt, branches, and flour to create the tree line. Lastly, we added animals to our mountains and play with them among our friends!