atmosphere	is the layer of gases that surrounds Earth
Relative humidity	is the ratio of water vapor the air contains to the maximum amount it could have at that temperature
Air pressure	is the force exerted by air on the area below it
troposphere	the lowest layer of the atmosphere, the one directly above the ground
stratosphere	is the layer of the atmosphere above the troposphere
ozone layer	Ozone is concentrated in a portion of the stratosphere
mesosphere	the layer that extends 50-80 kilometers (31-50 miles) above se level
thermosphere	is the top layer, which begins about 80 kilometers (50 miles) above Earth's surface and extends upward into space
radiation	the transfer of energy through space
conduction	is the transfer of heat directly between two objects that are in contact with one another
convention	is the transfer of heat by the movement of currents within a fluid
convention currents	sinking cool air and rising warm air
air mass	thoughout a large body of air
front	the boundary between air masses that differ intemperature and moisture
air pollution	is the release of damaging materials into the atmosphere
emissions	the substance released
fossil fuels	are carbon-containing fuels that formed millions of years ago from the remains of living things
primary air pollutants	such as soot and carbon monoxide, are polutants released directly into the troposphere
secondary air pollutants	harmful products produced when primary air pollutants react chemically with other substances
smog	is an unhealthy mixture of air polluntants that may form over cities and nearby areas
temperature inversion	is the condition in the troposphere in which a layer of cooler air is located beneath a layer of warmer air
acid deposition	water vapor containing acids that falls to the ground as rain, snow, sleet, or hail
clean air act	protects and improves the quality of air in order to safeguard human health and the environment
catalytic converter	is a device in a motor vehicle that reduces the amount of air pollutants in emissions
scrubber	removes pollutants or changes them chemically before they leave factory smokestacks
ozone hole	for the area of lowered ozone concentration over Antartica that occurs every year from August until October
Chlorofluorocarbons (CFCs)	are a family of chemical compounds containing chlorine, fluorine, and carbon
Montreal Protocol	a treaty that limits the production of chlorofluorocarbons

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