1. Which human activity greatly contributes to the greenhouse effects?

a. Men burn a lot of fossil fuel.
b. Burning of fuels cause smog.
c. Manufactures release gases and particles into the atmosphere.
d. tractors in construction equipment releases dust into the atmosphere.

2. Which of the following greenhouse gasses can cause the thinning of the ozone layer?

a. ozone layer
b. nitrogen gas
c. chlorofluorocarbons
d. nitrogen oxide

3. Which of the following should you avoid using to prevent the destruction of the ozone layer?

a. a electric fan
b. air freshener with GHG
c. farm insecticide spray
d. air conditioners

4. Which gas has them most amount present in air?

a. oxygen
b. nitrogen
c. carbon dioxide
d. water vapor

5. In which condition would there be a greenhouse effect?

a. Inside a closed house on a summer day
b. Inside a movie theater
c. Under a tree during summer time
d. Under the sea on a rainy day

6. Which would best explain why there is a greenhouse effect on earth?

a. The sun emits energy and the energy hits the ground.
b. Some of the sun's energy is trapped inside the earth's atmosphere.
c. Only a part of the sun's energy is irradiated back beyond the atmosphere.
d. All of the above.