All terms in this list:

Atmosphere: A layer of air that surrounds the earths surface

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

Tropopause: layer of 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.

Statopause: 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