Howstuffworks "Air - Encyclopedia Entries"

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Featured Air Entry

Stratosphere is a layer of Earth's atmosphere. It lies above the troposphere, the atmospheric layer nearest Earth. The stratosphere begins about 6 miles (10 kilometers) above Earth's surface in the polar regions and about 12 miles (19 kilometers) near the equator. The upper boundary, called the stratopause, lies at an altitude of about 30 miles (48 kilometers). More »

THE AIR LIBRARY

Air

Air is the mixture of gases that surrounds Earth. It is often called the atmosphere. Air covers... More >>

Atmosphere

Atmosphere is a measure of atmospheric pressure. One atmosphere is a pressure 14.696 pounds per... More >>

Ionosphere

Ionosphere, eye ON uh sfeer, is a part of Earth's atmosphere that has many ions (electrically... More >>

Mesosphere

Mesosphere, MEHS uh sfeer, is the region of Earth's upper atmosphere in which temperature drops... More >>

Stratosphere

Stratosphere is a layer of Earth's atmosphere. It lies above the troposphere, the atmospheric... More >>

Thermosphere

Thermosphere, THUR muh sfihr, is the uppermost temperature region of Earth's atmosphere.... More >>

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