Clouds Facts

Clouds can reflect so much ultraviolet light from the sunlight they dramatically increase the ultraviolet reaching the ground.

Sunbathing on sunny days with clouds in the sky can be dangerous.

The biggest clouds are cumulonimbus, climbing up to 9.7 kilometers (6 miles) high and holding up to half a million tons of water.

Cloud droplets are extremely small. They are about ten thousandth of an inch across, a thousand times smaller than a raindrop.