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

The heat radiated by the earth in the form of long waves is called:

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

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

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