Great Lakes

How were the Great Lakes created?

• by the clearing of forests

• by the damming of rivers

• by the melting of glaciers

• by the shrinking of oceans

Which term is best defined as a geographic area that includes all of the rivers and streams that flow into a lake or sea?

• basin

• landmass

• plateau

• watershed

Which of the terms below best fits what is being described?

Insects feed on the algae and plants that grow in the Great Lakes. Tiny fish eat the insects. Larger fish feed on the small fish. Eagles and otters eat the larger fish.

• Great Lakes habitat

• Great Lakes watershed

• Great Lakes food chain

• Great Lakes freshwater ecosystem

Which of the following suffered most from DDT poisoning in the Great Lakes

• fish-eating birds

• large fish

• small fish

• tiny organisms

The sea lamprey and zebra mussel are part of which of these Great Lakes ecosystem problems?

• wetland loss

• invasive species

• algae explosions

• point-source pollution

Which conclusion about Michigan is best supported by the graph above?

• Housing areas are expanding.

• Dairy farms are a leading industry.

• The lumber industry is shrinking.

• Wetlands are becoming more polluted.

What is the main difference between point-source and non-point-source pollution?

• how toxic the pollution is

• where the pollution comes from

• what time of year the pollution occurs

• what animals are harmed by the pollution

Which of these is a major reason for a growing water shortage in many countries?

• habitat loss

• invasive species

• shrinking glaciers

• population growth

Why are the Great Lakes often called “the fourth seacoast”?

• Because the Great Lakes are filled with salt water, like the ocean

• Because the Great Lakes are the world’s largest freshwater ecosystem

• Because the Great Lakes are so large that they look and act like oceans

• Because the Great Lakes are a watershed

Which of the following is a cause of habitat loss in the Great Lakes?

• loss of forests and wetlands to industrial activity

• introduction of invasive species

• the harm DDT inflicts on birds

• how smaller watersheds drain into larger watersheds