What is an estuary?

Number of endangered species in the United States has________.

Why has the number of endangered species increased?

What fossil fuel is used the most in the U.S to produce electricity?

What cause is changing the Earth's temperature the most?

Which of the items can be recycled?

Which is the best definiton of a nonrenewable resource?

Which is not an environmental impact from mining coal?

Which is the best definition of a natural resource?

Which of the following is not a advantage of using alternative energy sources?

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