1. Which of the terrestrial worlds has the lowest average crater density?

a. Mercury.
b. Venus.
c. Earth.
d. The Moon.
e. Mars.

2. The greenhouse effect has changed the temperature of which terrestrial world most dramatically?

a. Mercury.
b. Venus.
c. Earth.
d. The Moon.
e. Mars.

3. The ozone layer in Earth's atmosphere ...

a. protects against Solar ultraviolet radiation.
b. has been thinned due to chemical reactions involving CFCs (chloroflourocarbons).
c. is expected to recover in roughly 50 years due to international cooperation on pollution controls.
d. All of the above.
e. None of the above.

4. The carbon dioxide in the atmospheres of the larger terrestrial worlds was released by ...

a. the impacts of cometary bodies.
b. chemical reactions involving liquid water.
c. volcanic activity.
d. All of the above.
e. None of the above.

5. The second most common component of the original atmospheres of the terrestrial worlds was ...

a. oxygen.
b. nitrogen.
c. water vapor.
d. argon.
e. uranium.

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Last modified 10 November, 2006. © Gregory C. Sloan.