Clouds

Clouds are formed when the sun evaporates water. The vapor rises and becomes cooler. When it is cool enough, it condenses. Each droplet forms round a speck of dust in the air. Millions and millions of these droplets, gathered in a big mass, form a cloud.

HIGH ALTITUDE CLOUDS
Cirrus, Cirrocumulus, Cirrostratus, Altostratus, Anvil Clouds Above 20,000 feet	Click here for more.
MEDIUM ALTITUDE CLOUDS
Altocumulus, Stratocumulus, Cumulus 7,000 to 20,000 feet	Click here for more.
LOW ALTITUDE CLOUDS
Cumulonimbus, Stratus, Nimbostratus, Fog Below 7,000 feet	Click here for more.

Rainbows are actually the suns rays separated into different colors by water droplets in the air acting as prisms.

FUN-FACT: Clouds are white because tiny water droplets in clouds reflect the sun like a mirror reflects light. Thick clouds look dark gray underneath because little sunlight can pass through them.