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| the gases, droplets, and particles surrounding Earth’s surface |
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| the science that studies the atmosphere |
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| day-to-day conditions of the atmosphere |
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| the statistical properties of the atmosphere, including measures of average conditions, variability, etc. |
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| the study of long-term atmospheric conditions |
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| those gases whose relative abundance is constant within the atmosphere |
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| gases present in amounts that vary greatly in abundance, either vertically, horizontally, or seasonally. water vapor is the most important variable gas |
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| water in its gaseous phase, not to be mistaken for small water droplets. Colorless and odorless, it seldom amounts to more than a few percent of the total atmospheric mass |
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| the perennial movement of water in its three phases between the atmosphere, Earth’s surface, and groundwater. |
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| an important variable gas in the atmosphere, made up of one atom of carbon bound to two atoms of oxygen. An important greenhouse gas |
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| the growth process of green plants, whereby water and carbon dioxide are converted to carbohydrate, releasing oxygen |
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| molecules consisting of three oxygen atoms, most abundant in the middle and upper atmosphere |
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| small, suspended particles in the atmosphere |
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| the mass of a substance per unit volume, expressed as kilograms per cubic meter in the International System of Units |
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