Clouds

The heat from the Sun makes water from rivers, lakes, seas and oceans evaporate. This water vapour rises up into the sky and when this meets colder air, it condenses and forms a cloud.

Shapes of clouds

Cirrus

Small clouds, white, thin and sometimes in strips, which may indicate rain.

Cirrocumulus

Clouds made up of small crystals of ice. These clouds indicate cold weather.

Altostratus

An expanse of white or grey clouds which brings rainfall.

Altocumulus

These have an irregular shape, and can be white, greyish, in layers or all over.

Cirrostratus

Cloud in the form of see-through layer and can be a sign of rain or snow.

Nimbostratus

Typical rain clouds, dark and grey.

Stratocumulus

Grey clouds, round and width bulges. They bring light rain.

Stratus

A low grey, thick layer of cloud bringing drizzle and sleet.

Cumulus

White clouds, piled up high in the sky. Small sized cumulus clouds indicate fine weather.

Cumulonimbus

This looks like a tower, dark at the base. It brings storms.


What How Why

What is a Light Year?

The unit of measurement used to calculate distances in space is called Light Year. It is the distance which light travels in one year. 1 Light-Year = 9460 billion km. (approx)