What Makes A Watershed?
A watershed is all the area of land that drains into one main lake or river. It can contain many smaller streams, rivers and even lakes, which all eventually drain into a larger lake, sea or ocean. The location of the highest land on the continent determines the direction that a watershed drains. This high land is called the Continental Divide. In North America it is in the Rocky Mountains. On the west side of the divide, the rivers all flow into the Pacific Ocean. On the East side of the divide, the rivers flow into either the Arctic Ocean or the Atlantic Ocean. Streams and Drainage Systems: http://www.tulane.edu/~sanelson/geol111/streams.htm 2.3 Processes That Shape Ocean Basins and Continental Drainage The Earth is in a constant state of change. Processes That Form Ocean Basins The Theory of Plate Tectonics (you learned about in Grade 7) explains how the lithosphere (crust of the Earth) is in pieces and these pieces are moving because of convection currents in the magma. Some of the
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