Release of gases to the atmosphere from hot, molten rock during volcanic activity and from impact of meteorites on the rocky surface of the planet; origin of most atmospheric gases.
The process whereby plants use sunlight, water, and carbon dioxide to manufacture their food and generate oxygen as a byproduct.
The atmosphere above 80 km.
The atmosphere up to 80 km; nitrogen and oxygen are constant.
Tiny liquid or solid particles of various compositions that occur suspended in the atmosphere.
Indicates weather conditions at a specific location, using a combination of symbols on a map.
A small balloon-borne instrument package equipped with a radio transmitter that takes altitude readings of temperature, air pressure, and humidity in the atmosphere.
Continuous altitude measurements that provide vertical profiles of such variables as temperature, humidity, and wind speed.
Lowest thermal subdivision of the atmosphere in which air temperature normally drops with altitude; the site of most weather.
The atmosphere's thermal subdivision situated between the troposphere and the mesosphere; ozone formed here.
The atmospheric layer between the stratosphere and the thermosphere; temperature falls with increasing altitude.
The outermost thermal subdivision of the atmosphere above the mesopause in which air temperature is isothermal in the lower reaches and then increases with altitude.
Top of the troposphere.
Top of the stratosphere.
Top of the mesosphere.