Introduction+and+Geography+Section+Per+6

= During the Ice Age snow glaciers covered North America.Now that it is over it was where Chicago is.The glacier reshaped the landscape,grinding rocks into sand,making stream beds, and flattening mountains.Then Earth began to warm and the ice melted.It left behind new land,thus the Great Lakes were created.Over time an ecosystem developed. = ==**Five lakes make up the Great Lakes,Lake Superior,Lake Michigan,Lake Huron,Lake Ontario,and Lake Erie.Only one lake is entirely in the United States,and that lake is Lake Michigan.The other four lakes are shared between Canada and the United States.The Great Lakes form the largest group of freshwater lakes on the Earth.More than one-tenth of the United State's population and one-forth of Canada**'s population live around the Great Lakes.Both countries depend on the Great Lakes for irrigation on farms,generating electric power,shipping,fishing,and recreational activity.==

==**Large watersheds mainly come from hills and fall to the ground,then the water runs downhill,some of the water soaks into the ground.If there were a hole there then the water may be able to form a lake.A watershed is a geographic area that includes** a lot of land and waterways, that drain into a body of water.==

==The Great Lakes region is a vast ecosystem.One way to understand how the living things in the Great Lakes ecosystem are related to one another is to look at who eats what.These relationships make up what scientists call a food web.Food webs include both plants and animals that feed on each other.Food chains are a series of plants and animals, each of which depends on the next for food.In the Great Lakes ecosystem,for example, one good chain might begin with plants that grow in lakes and rivers.These insects are eaten by tiny fish,which are then eaten by larger fish.== 

1.When did glaciers cover North America? a.100 years ago b. never c.yesterday d.During the Ice Age

2.How many lakes are in the Great Lakes? a.10 b.3 c.5 d.6

3.What drains into a body of water? a.delta b. watershed c.lake d.ocean

4.What 2 words below include plants and animals? a.saltwater lake b.coniferus forest c.Food chain d.freshwater lake