Assertion (A): Heat absorption capacity of air is more in the lower layers than in upper layers.

Reason (R): Air on the surface of the earth is denser and contains more carbon dioxide, water vapour and other gases.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

The solar energy received by the earth is called:

1. Radiation
2. Insolation
3. Greenhouse radiation
4. Precipitation radiation

When both incoming radiation and outgoing radiation are balanced, it is called:

1. Convection
2. Terrestrial radiation
3. Heat balance
4. Conduction

Of the insolation, 35% is reflected by the atmosphere; how much reaches the earth's surface?

1. 14%
2. 51%
3. 35%
4. 34%