Cyclones can be classified into
(i) Tropical cyclones
(ii) Temperate cyclones
(iii) Extra Tropical cyclones

a. drizzle
b. rain 
c. sleet
d. snow 
e. heat
a. Drizzle:
(i) Falling of numerous uniform minute droplets of water with diameter of less than 0.5 is called a drizzle mm from low clouds.
(ii) Sometimes drizzles are combined with fog and hence reduce visibility.
b. Rain:
(i) Rain is the most widespread and important form of precipitation in places having temperatures above the freezing point.
(ii) It occurs only when there is abundant moisture in the air. The diameter of a rain drop is more than 5 mm.
c. Sleet:
(i) Sleet refers to aprecipitation in the form of pellets made up of transparent and translucent ice.
(ii) This precipitation is a mixture of snow and rain ..
d. Snow:
(i) Snow is formed when condensation occurs below freezing point.
(ii) It is the precipitation of opaque and semi opaque ice crystals.
(iii) When these ice crystals collide and stick together, it becomes snowflakes.
e. Heat:
(i)Is the energy which makes objects hot, while temperature measures the intensity of heat

Based on the mechanisms of raising the air, there are three types of rainfall.
(i) Convectional rainfall
(ii) Frontal (or) cyclonic rainfall
(iii) Orographic rainfall

(i) A visible mass of condensed water vapour floating in the air above the ground level is called is cloud.
(ii) Cool moisture laden air gets collected around particles like dust, salt content from the sea, smoke, etc, and forms clouds.
(iii) Sometimes mixing warmer and cooler air also produces clouds.

(a) Trade winds:
(i) Trade winds blow from the subtropical high pressure belt to the Equatorial low pressure belt in both the hemispheres.
(ii) They blow with great regularity, force and in a constant direction throughout the year.
They are very helpful to the traders.
(b) Roaring forties:
(i) Westerlies are the permanent winds.
(ii) They blow from South West to North East in the Northern hemisphere and North West to South East in the Southern hemisphere.
(iii) The velocity of westerlies become so vigourous and fast to be called Roaring forties at 40°.