Available Answers

1. 1.

   Fill in the blanks.

   1. ___________ and _________ are examples of greenhouse gases.
   2. _________ _________ is a major cause of climate change.
   3. The _________ in earth's temperature is called global warming.
   4. The layer of atmosphere where ozone is found is called __________.
   5. The ozone layer protects us from the _________ of the sun.
2. 2.

   Write True ot False.

   1. Aeroplanes flying in the sky cause global warming.
   2. Forest fires do not cause global warming.
   3. Ozone is found in the troposphere.
   4. he ozone layer is harmful for humans and animals.
   5. CFCs nd BFCs protect the ozone layer.
3. 3.

   Choose the correct option.

   1. Oxygen/Carbon dioxide is a greenhouse gas.
   2. Use of fossil fuels / hydroelectricity causes global warming.
   3. Cattle release methane / CFCs.
   4. Global warming will reduce / increase climate change.
   5. The ozone layer is found between 20 and 40 / 40 and 60 km above the earth's surface.
4. 4.

   Match the following.

   A	B
   1. ozone depletion	i. GHG
   2. methane	ii. disappearance of habitat
   3. deforestation	iii. UV rays from the sun
   4. fossil fuel	iv. CFCs
   5. global warming	v. comes from cattle

    

5. 5.

   Why do we call carbon dioxide a greenhouse gas?

6. 6.

   Name two more greenhouse gases.