II. Put the correct word for the sentences below.

1. The ____________________________ occurs when the earth's atmosphere traps certain gases such as carbon dioxide as well as water vapour. This makes the earth's surface warmer.

2. _____________________________ is harm or injury that makes something less valuable or able to function.

3. To _________________________________ is to keep and protect something from damage, change or waste.

4. ______________________ are non-renewable energy sources such as coal, fuel oil and natural gas formed from dead plants and animals underground.

5. ___________________ is the gradual increase of temperature on the earth's surface due to greenhouse effect.

6. _________________________________ is the using up or reducing something like energy or resources.

7. To _________________________________ is to make air, water, or soil dirty or unclean.

8. ______________________ is the removal or cutting down of all trees in an area for urban use and farm lands.

Unit 9 - (HS)