Clouds are floating bodies in the atmosphere which are visible in various shapes and sizes. Any planet in the solar system having atmosphere like Earth, Venus, Jupiter, Saturn and Mars will have clouds, which are essentially condensed water droplets. Sometimes these clouds also contain crystals of ice. These are formed when air comes in direct contact with a cold surface, or if a surface is cooled by radiation and air blows over such surface. Since the temperature of the air falls below saturation level, the cloud is formed which moves up to higher levels.

When water in lakes, ponds, rivers and sea get warm by absorption of heat from the sun, they evaporate and this water vapor condenses at higher altitudes forming clouds.

When two bodies of air in the atmosphere having different saturation temperatures mix together, it results in formation of clouds. When warm air blows over a surface, which is cold, water droplets get accumulated. These droplets then get lifted into the air and this moves up to higher altitudes forming clouds. Sometimes the surrounding air remains at the same temperature, but absorbs more moisture causing condensation of water to form clouds.

Cold or warm surfaces and even sides of mountains are suitable for forming clouds.

If the cloud is formed by warm air moving over cold surfaces causing water vapor to get carried away, the color of such clouds is white. When the water droplets in the clouds combine and form bigger droplets owing to the cloud maturing, they appear grey or blackish in color. Other colors like yellow, green or blue are created naturally in the clouds.

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