by 
Anonymous
ANSWERS: 5
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Rivers are long, narrow bodies of flowing water that occupy channels, and move to lower levels under the influence of gravity.
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water and gravity
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Like electricity, water takes the path of least resistance down the hill(s) toward the ocean.
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The Mississippi River, like all rivers, is in a constant state of change. Various forms of the Mississippi River have flowed through our area for more than a million years, but the Upper Mississippi River Valley as we know it was primarily shaped during the most recent glacial stage of the Great Ice Age, The Wisconsin period. The Wisconsin glaciation period started about 75, 000 years ago and ended about 12,000 years ago when the North American climate began to warm. It was a world hardly recognizable today. Minnesota and Wisconsin were populated by a variety of very large animals called megafauna which lived in the cold climate on the margins of the glacial ice. Because larger animals lost body heat more slowly, bigger was indeed better. This is some of it. You get the idea. Water, a lot of it and a long long time.
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Mountaintops up in the clouds. Clouds are made of water vapour. Water vapour condenses into water (rain and dew). Water flows from the high mountains to the low plains emptying into the sea, always following the line of least resistance along the way.
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