Available Answers

1. 1.

   Match the following.

   a. Troposphere	i. Shuttles move
   b. Mesosphere	ii. Ozone layer
   c. Thermosphere	iii. Thinnest layer
   d. Stratosphere	iv. Meteorites move
   e. Exosphere	v. closest to the earth

    

2. 2.

   Fill in the blanks.

   1. The __________________ layer in the atmosphere protects us from the harmful ultraviolet rays of the sun.
   2. 78% of the atmosphere contains __________________ gas.
   3. __________________ gas is essential to breathe.
   4. Plants use __________________ gas to prepare food.
   5. Beyond the __________________ lies space.
3. 3.

   What holds the atmosphere close to the earth?
4. 4.

   Name any two gases that forms 1% of the gases present in the atmosphere.
5. 5.

   What does air contain?
6. 6.

   What is chlorination?