Give geographical reasons:

Air becomes saturated.

Look at figure 3.8 first. Now go out of the classroom in the ground. Observe the clouds in the sky. Discuss the following points in the class and write answers in your notebook.

• What was the colour and size of the clouds?

• What type of clouds did you observe? (Take help from fig 3.8)

• Can these clouds bring rain? Give reasons.

What will happen if the temperature of saturated air at 20° C drops down to 10° C abruptly?

During winters, when you exhale on the glass of your mirror, what happens. If you try to do this in summer why doesn’t this happen?

Look at the pictures shown in figure 3.1. Discuss the weather conditions shown in these pictures in the class and write the descriptions in the boxes below

Solve the following:

When the temperature of the air is 30° C, its vapour-holding capacity is 30.37 gms/ cu.m. If absolute humidity is 18 gms / cu.m. then what would be the relative humidity?

Give geographical reasons:

The proportion of relative humidity changes according to altitude.

Give geographical reasons:

Cumulus clouds change into cumulonimbus clouds.

Match the column and complete the chain:

Give geographical reasons:

Air becomes saturated.

Give geographical reasons:

Clouds float in the sky.