The ________ screens out much of the Sun's UV rays

The top of the water-filled spaces in the ground is the

Dangerous air pollution is called

A(n) ________ is a storage area for fresh water

A type of precipitation caused by air pollution is

The continental slope of the ocean is steeper and deeper than the

What are two alternative resources of energy

Most of the Earth's oxygen supply is produced by

All of the following are example of nonrenewable resources EXCEPT

Geothermal energy comes from

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