What is the layer of gas that protects the Earth from the Sun\'s ultraviolet rays?

What percent of the Earth\'s water is salt water?

True or False: Most of the Earth\'s freshwater is ice.

The biggest contributor to global warming is:

In 1990, many countries banned the use of what gases because of their harmful effects on the environment?

The 3 R's are reducing, reusing, and _______________.

True or False: Reusing materials actually creates more waste than making new materials.

True or False: It is a federal law that all American's MUST recycle.

How many times can glass be recycled before it must be thrown away?

True or False: Styrofoam is a great product because it decomposes so quickly.

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