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The Great Lakes–St. Lawrence River Watershed

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The Great Lakes–St. Lawrence River Watershed

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Questions and Answers

What percentage of North America's freshwater is contained in the Great Lakes-St. Lawrence River watershed?

90 percent

50 percent

74 percent

84 percent (correct)

How many people live in the Great Lakes-St. Lawrence River watershed?

20 million people

30 million people (correct)

40 million people

10 million people

What is one of the biggest threats to the Great Lakes-St. Lawrence River ecosystem?

Climate change

Pollution

Invasive species (correct)

Overfishing

What is the estimated cost of damage caused by zebra mussels in the Great Lakes-St. Lawrence River watershed?

4 billion U.S. dollars Signup and view all the answers

Why are invasive species, such as the zebra mussel, able to thrive in their new environment?

They have no natural predators Signup and view all the answers

What is the impact of zebra mussels on native mussel species?

They outcompete them for food and space Signup and view all the answers

What is the role of wetlands in the ecosystem?

They provide a buffer between open water and land Signup and view all the answers

What is the result of the destruction of wetlands?

Native plant and animal populations are harmed, and invasive species increase Signup and view all the answers

What is the goal of the water resources agreement regarding pollution?

To ensure uniform laws to protect the freshwater system from harmful human influences Signup and view all the answers

What is the environmental impact of fertilizers used on farms in the watershed?

They lead to excessive growth of plants and algae, clogging waterways and killing fish Signup and view all the answers