10th form "What Is the Greenhouse Effect?"

1. The atmosphere is a blanket of gases ____ the Earth.

2. For thousands of years these gases ____ our planet's temperature at about 15 degrees above zero.

3. How? ____ trapping some of the sun's heat.

4. But now, _____ pollution, there are more gases in the atmosphere.

5. This means that the Earth _____ hotter.

6. A greenhouse becomes hot ____ some reason.

7. Its glass lets the sun's heat ____ through, then stops some of it.

8. That's why scientists call the problem of earth's _____ temperature "The Greenhouse Effect".

9. Pollution sends four main "greenhouse gases" ____ the atmosphere.

10. These are: carbon dioxide, Methane and Nitrous Oxide which _____ fertilizers and rubbish and others.