When water evaporates from land and different water bodies, it becomes water vapour.

Moisture in the air at any time, is known as humidity

When the water vapour rises, it starts cooling. The water vapour condenses causing formation of droplets of water. Clouds are just masses ofsuch water droplets. When these droplets of water become too heavy to float in air, then they come down as precipitation.

Precipitation that comes down to the earthin liquid form is called rain. Most of the ground water comes from rainwater.

On the basis of mechanism, there are three types of rainfall:

Nitrogen(78%)

Oxygen(21%)

Argon(0.93%)

Carbon Dioxide(0.03%)

Other(0.04%)

Troposphere-

Stratosphere-

Mesosphere-

Thermosphere-

Exosphere-

Weather is a hour-to-hour, day-to-day condition of the atmosphere.

Weather can change drammatically from day to day.

The average weather condition of a place for a longer period of time represents the climate.

Climate of a particular place is mostly fixed for a dacade of years or so.

The degree of hotness and coldness of the air is known as temperature.

The important factor influences the distribution of temperature is insolation.

Air pressure is defined as the pressure exerted by the weight of air on the Earth's surface.

As we go up the layers of atmosphere, the rpessure falls rapidly.

The air pressure is highest at sea level and decreases with height.

In areas where the temperature is high the air gets heated and rises. This creates a low-pressure area. Low pressure is associated with cloudy skies and wet weather.

In areas having lower temperature, the air is cold. It is therefore heavy. Heavy air sinks and creates a high pressure area. High pressure is associated with clear and sunny skies.

The air always moves from high pressure areas to low pressure areas.

The movement of air from high pressure areas to low pressure areas is called wind.

Winds can be broadly divided into three types, They are-

The trade winds, westerlies and easterlies are the permanent winds. These blow constantly throughout the year.

These winds change their direction in different seasons.

These winds blow only during a period of the day or year in a small area.