A _____ resource is one that is only available in a limited supply.

A _____ law of energy states that energy changes from high-quality to low-quality forms.

Which is NOT an example of kinetic energy?

Natural gas can be used once the _____ are removed.

In _____, the top layer of plants, soil, and rocks are removed.

Most fossil fuels come from ancient organisms, such as _____.

The type of fossil fuel used most by electric companies in the United States is _____.

Which type of energy source is used least by electric companies in the United States?

Which is NOT an example of potential energy?

_____ is a thick, liquid mixture of hydrogen, carbon, and other elements.

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