Essential for Life - Air & Water Worksheet-6

Essential for Life - Air & Water Worksheet-6

12. True/False

a.      Troposphere is the lowest layer of the earth.

b.      Thermosphere is the fourth layer (from the top) of the earth.

c.      We can get clean water by filtering the muddy water through cotton balls.

d.      Evaporating seawater is the oldest method of obtaining salt.

e.      Boiled water should be stored in a clean covered container.

f.       Pebbles are soluble in water.

g.      We fill up the ink/water in dropper due to air pressure.

h.      Depletion of ozone layer can cause skin cancer.

Miscellaneous Questions:

13. Identify and write the name of different layers of the Earth’s atmosphere.

(A) Exosphere                                (B) Thermosphere

(C) Mesosphere                             (D) Stratosphere

(E) Troposphere

Fill in the blanks:

14. The method of separating insoluble impurities from the solution by using filter paper is known as _____.

Answer Key:

(12)  a. True

b. False

c. False

d. True

e. True

f. False

g. True

h. True

(13)  (A) Exosphere

(B) Thermosphere

(C) Mesosphere

(D) Stratosphere

(E) Troposphere

(14)  filtration/filtrations