Available Answers

1. 1.

   Fill in the blanks.

   1. Water existing in gaseous form is called ___________.
   2. When the relative humidity is 100 per cent, the air is said to be _____________.
   3. About 90 per cent of water in the atmosphere is produced by __________ from waterbodies on the Earth.
   4. __________ is the process by which ice changes into water vapour without first becoming liquid.
   5. __________ is the process by which water vapour in the air is changed into liquid water.
2. 2.

   Write (T) for true and (F) for false.

   1. When air is saturated, the air temperature is said to be at dew point.
   2. The rate of evaporation increases when it is hot and dry.
   3. Drizzle is a form of condensation.
   4. Convectional rainfall occurs in the equatorial region.
3. 3.

   The amount of water vapour present in the air varies from place to place. Give reasons.

4. 4.

   The atmosphere is the superhighway through which water/moisture moves around the globe. Give reasons.

5. 5.

   Rain is the most important form of precipitation. Give reasons.

6. 6.

   Hailstones are harmful for crops. Give reasons.