All terms in this list:

Atmosphere: the layer of air that surrounds the earth's surface

Troposphere: the bottom layer of the atmosphere, containing most of its gases

Tropopause: layer constant temperature in the atmosphere, just above the troposphere and below the stratosphere

Stratosphere: area of the atmosphere that extends from about 11 to 50 kilometers above the surface

Stratopause: layer of constant temperature in the atmosphere, just above the stratosphere and below the mesosphere

Mesosphere: the second highest level of the atmosphere, composed mainly of oxygen and nitrogen

Ozone: a form of oxygen found in the atmosphere which absorbs harmful solar radiation

Thermosphere: the uppermost layer of the atmosphere, composed mainly of hydrogen and helium

Ionosphere: the lower part of the thermosphere containing charged atoms called ions

Exosphere: the upper part of the thermosphere

Ions: Charged atoms