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| Warmer air from the south and colder air from the north
meet over the midlatitudes and produces clouds. These clouds, in turn,
drop rain and snow on the region. The rain and snow waters the pines,
fills rivers, and runs to the Great Lakes.
The logging and timber industry used the abundance of water in the region to their benefit. They floated cut logs down the rivers so that they would not have to be carried. Prior to the arrival of Europeans to the Great Lakes region, fire and strong wind were the natural means for clearing trees. But how do the white pines use their physical environment to grow?
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