Essential for Life - Air & Water Worksheet-2

Essential for Life - Air & Water Worksheet-2

12. True/False:

a.      Argon is colourless and odourless gas.

b.      Mesosphere is the topmost layer of the earth.

c.      Ozone layer protects us from the harmful ultraviolet rays of the Sun.

d.      The rate of sedimentation can be improved by adding special chemical such as alum.

e.      Boiling is the only method of purifying the water.

f.       Rain is caused due to condensation of water vapour in the clouds.

g.      Sand is soluble in water.

h.      Pure wax can be extracted by using the process of distillation.

13. Match the column.

Fill in the blanks:

14. ____ are the small rocks which move around in space.

15. The method of purifying the water by adding chlorine tablets to kill the germs is known as ____.

Answer Key:

(12)  a.True

          b. False

          c. True

          d. True

          e. False

          f. True

          g. False

          h. True

(13)  1-e

          2-a

          3-d

          4-b

          5-c

(14)  meteoroid/meteoroids

(15)  chlorination