Choose the Best Answer.

1. 
Another word for era in "This era is known as the Ice Age." is ______.

2. 
If something penetrates a thing, it ______. "Once again, the sun's warmth was able to penetrate the clouds. "

3. 
Thawing in "The ice melted, except at the earth's two poles- areas too far from the sun to experience temperatures high enough to cause thawing." means ______.

4. 
Which word could best replace precisely in "The climate of the earth is precisely balanced to support a variety of life forms that depend on a range of temperatures."?

5. 
The equator in "These temperatures range from extremely cold at the poles to extremely hot near the center of the earth at the equator." is ______.

6. 
Which word could best replace synthetic in "Unfortunately, the growth of fuel-burning industries and an increase in previously unknown synthetic compounds have altered this filter."?

7. 
Something that is irreversible is ______. "Widespread use of aerosol sprays and air conditioning has already caused irreversible damage to the ozone layer."

8. 
Infiltrate in "This hole in the earth's natural filter allows more sunlight to infiltrate the atmosphere." means _______.

9. 
Meteorological in ". These and other meteorological events all threaten to disturb the balance the earth's climate must maintain." means ______.

10. 
Another word for forswear in "Numerous scientific and environmental groups have asked that people forswear the use of aerosol sprays and certain coolants in the hopes of halting the dangerous loss of ozone in our atmosphere." is ______.

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