Which two gases make the bulk of the atmosphere?

3

(a)

What is weather?

3

(a)

Name three types of rainfall

3

(a)

What is air pressure?

3

(a)

Briefly explain the composition of the atmosphere.

3

(a)

How do bacteria help plants in using nitrogen?

3

(a)

What is the cause of high temperature in cities as compared to that of villages?

3

(a)

Why do astronauts wear special protective suits when they go to the Moon?

3

(a)

How carbon dioxide balance gets disturbed on the Earth?

3

(a)

Why jet planes flying in the sky leave a white trail behind them?

3

(a)

Differentiate between weather and temperature

3

(a)

How does nature balance our life? What is the result if this balance is disturbed?

3

(a)

Why is high pressure found in cold region?

3

(a)

Distinguish between rainfall and snowfall.

3

(a)

Explain the circulation of air in the atmosphere.

3

(a)