Seawater provides about one-third of the world's _______________.

How has the amount of energy needed today changed from the amount used fifty years ago?

Coal was formed from what?

Factories use water to cool off their equipment, and this can cause the water to be unsuitable.

Cutting down trees for lumber can cause the carbon dioxide levels to increase in the atmosphere.

Cutting down forest is bad because it can cause _____________

What is a disadvantage to using wind energy as a energy source?

Solar energy, wind energy, and geothermal energy are examples of

Where does the energy burned by fossil fuels originally come from?

Which of the following is not a fossil fuel?

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