The Great Lakes: The U.S. and Canada's Freshwater Treasures

The percentage of the Earth's water that is able to meet human needs is around

A series of plants and animals, each of which depends on the one below it for food is called

What is the main way invasive species enter the Great Lakes watershed?

If a fish in the Great Lakes is poisoned, which of the following is likely to be affected?

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

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

What is the greatest threat to wetland habitats in the Great Lakes region?

What could cause some areas to get more or less rainfall than they do today?

What was a result of the new laws to protect the Great Lakes?

How many lakes make up the Great Lakes?

Which of the following is NOT a way to reduce the number of sea lamprey?

What happened in 1972 that helped protect the Great Lakes?

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

Which of the following species have been introduced to reduce the invasive species of alewives?

The Great Lakes were created by the movement of