north_america

north_america - North America 1. Physical Geography a. The...

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North America 1. Physical Geography a. The continent of North America i. These regions are based on physical and cultural aspects. Mexico, the USA, and Canada are parts of the North American continent. ii. Major Landforms 1. Glacial landforms in the central lowlands a. About 2 million years ago, there were given periods of ice ages and warming periods. The last ice age ended about 10,000 years ago. Large masses of ice had formed (glaciers), and one was 2 miles thick that covered parts of the US. This sheet of ice created a landscape (Great Lakes, et cetera). b. The glacier covered all of Canada from the North Pole, over Greenland, down into the northern central part of the US. As the glacier grew, it created landforms. As it started to recede, more landforms were created. These landforms were created through several processes. i. Erosion , which is caused by the movement of water, processes called plucking and abrasion. They are associated with the movement of the ice. 1. Plucking - as the glacier moved, it picked up pieces of rocks and carried them with it, then deposited it somewhere else. 2. Abrasion - the scratching and scarring as the glacier moves over the land. The things picked up in plucking rub against the land and form things that are now evident (Great Lakes). ii.
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north_america - North America 1. Physical Geography a. The...

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