Clear nights are colder than cloudy nights because of

Horizontal transfer of heat through the wind is

Relative humidity is measured using the instrument called 

The incoming solar radiation on earth is known as ____________

As we go up in troposphere layer of the atmosphere the pressure

Consider the following statements about Nimbus clouds:
1. These are thick dark - grey or black clouds
2. They are found at very low height
3. They bring sharp showers, and rumble with lightning and thunder
Which of the above statements are true?

The difference between the maximum and minimum temperatures recorded for a place during a period of one day is called :

Which is an imaginary line joining places having equal temperature, reduce to sea level?