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Chapter 15
Earth's Changing Atmosphere
Term | Definition |
---|---|
atmosphere | the outer layer of gases of a large body in space, such as a planet or star; the mixture of gases that surrounds the solid Earth; one of the four parts of the Earth system |
altitude | the distance above sea level |
density | a property of matter representing the mass per unit volume |
cycle | a series of events or actions that repeat themselves regularly; a physical and/or chemical process in which one material continually changes locations and/or forms to move through a repeating series of events or actions |
radiation | energy that travels across distances as certain types of waves |
conduction | the transfer of heat energy from one substance to another through direct contact without obvious motion |
convention | the transfer of energy from place to place by the motion of heated gas or liquid |
ultraviolet radiation | radiation of higher frequencies that visible light, which can cause sunburn and other types of damage |
infrared radiation | radiation of lower frequencies than visible light |
ozone | a gas molecule that consists of three oxygen molecule atoms |
greenhouse effect | the process by which certain gases in a planet's atmosphere absorb and emit infrared radiation, resulting in an increase in surface temperature |
greenhouse gases | Gases, such as carbon dioxide and methane, that absorb and give off infrared radiation as part of the greenhouse effect |
air pollution | harmful materials added to the air that can cause damage to living things and the environment |
particulates | tiny particles or droplets, such as dust, dirt, and pollen, that are mixed in with the air |
fossil fuels | fuels formed from the remains of prehistoric organisms that are burned for energy |
smog | the combination of smoke and fog; a type of air pollution that occurs when sunlight causes unburnt fuels, fumes, and other gases to react chemically, often seen as a brownish haze |