This brief self examination tests your knowledge
of the six most important gases in the atmosphere. Good Luck!
1. Which gas is the most abundant in the atmosphere?
2. Which gas is the dominant greenhouse gas?
3. Which gas protects us from UV-B radiation and
is a greenhouse gas?
4. Which gas is essential for life and protects us
from UV-C radiation?
5. Which gas has no permanent electric dipole moment
yet is a major greenhouse gas?
6. Which gas comprises almost 1% of the dry air?
Last Updated: October 14, 1996