Photograph of cumulus clouds in the mountains of Colorado. Click on image for full size version (107K GIF) Courtesy of Lisa Gardiner

Clouds are the pretty white fluffs you see in the sky. They are made up of tiny water drops. Sometimes, if the wind is fast enough, you can even watch the clouds move.

Clouds can come in all sizes and shapes and are formed by different processes. They can be near the ground or way up high. Ever wonder what different types of clouds are called?

Different types of clouds cause different kinds of weather. Sometimes clouds get dark and scary looking when a thunderstorm or tornado is about to start.

At any given time, about half of Earth is covered by clouds. We would not have rain, rainbows, or snow without clouds. The atmosphere would be boring if the sky was always blue!

Photograph of cumulus clouds in the mountains of Colorado. Click on image for full size version (107K GIF) Courtesy of Lisa Gardiner

Clouds can come in all sizes and shapes, and can form near the ground or high in the atmosphere. Clouds are groups of tiny water droplets or ice crystals in the sky and are formed by different processes. They can make different kinds of precipitation depending on the atmosphere's temperature.

Cloud types are classified by height and appearance. The shape depends on the way the air moves around the cloud. If air moves horizontally, clouds form spread-out layers. Clouds grow upward if air is moving vertically near the cloud.

At any given time, clouds cover about 50% of the Earth. We would not have rain, thunderstorms, rainbows or snow without clouds. The atmosphere would be boring if the sky was always clear!

Photograph of cumulus clouds in the mountains of Colorado. Click on image for full size version (107K GIF) Courtesy of Lisa Gardiner

Clouds can come in all sizes and shapes, and can form near the ground or high in the atmosphere. Clouds are groups of tiny water droplets or ice crystals in the sky and are formed by different processes. They can produce different kinds of precipitation dependent on the atmosphere's temperature.

Cloud types are classified by height and appearance. The shape depends on the way the air moves around the cloud. If air moves horizontally, clouds form in spread-out layers. However, clouds grow upward if air movement is vertical. Clouds reach higher heights near the equator and develop at lower heights near the poles.

At any given time, clouds cover about 50% of the Earth. We would not have rain, thunderstorms, rainbows or snow without clouds. The atmosphere would be quite boring if the sky was always clear!