Chapter 4: The US and Canada Page 116 to 122

Picture This… Standing at the edge of the Grand Canyon, you can see for miles. Its sheer size --- 277 miles long with walls rising up to 6000 feet --- is almost mind boggling. In fact, the Grand Canyon was formed by the Colorado River over a period of 6 million years!

Eastern Lowlands and Highlands Broad Lowland Along Atlantic Appalachian Mountains Megalopolis

Central Lowlands Also called the Great Plains Grassy Hills and Fertile Farmland Important Waterways

Critical Think Question Why do you think large cities like Chicago, Detroit, and Toronto developed in the Central Lowlands?

Western Mountains Cordillera --- A group of mountain ranges Created by collisions of Tectonic Plates Rocky Mountains and Pacific Mountain Chains

The Great Lakes The worlds largest group of fresh water lakes Water flows into St. Lawrence River Then into the Atlantic Ocean St. Lawrence Seaway

The St. Lawrence Seaway System of locks and canals Permits ocean-going vessels to enter the Great Lakes