Water vapour is added to the atmosphere by ……………. .

1. evaporation
2. transpiration
3. respiration
4. All of the above

Clouds and weather phenomenon occur in the Troposphere but some clouds are found in the Mesosphere. Why?

1. Meteoric dust particles reflect sunlight causing wispy clouds.
2. Some water particles reach the Mesosphere to form clouds.
3. Ions from the ionosphere deflect sunlight giving the impression of clouds.
4. None of the above.

The decrease in the temperature is known as the:

1. Normal temperature rate
2. Decreased temperature rate
3. Normal lapse rate
4. Decreased lapse rate

Name the layer which contains ions electrically charged particles which create a sheet like display of light known as Aurora Borealis in the northern hemisphere.

1. Ionosphere
2. Exosphere
3. Stratosphere
4. Mesosphere