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| the condition of Earth's atmosphere at a particular time and place |
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| the mixture of gases that surrounds Earth. The outermost of the four spheres into which scientists divide earth. |
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| a form of oxygene that has three oxygene atoms in each molecule instead of the usual two. |
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| the invisible, gaseous form of water. |
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| harmful substances in the air, water, or soil. |
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| a brownish haze that is a mixture of ozone and other chemicals, formed when nitrogen oxides, hydrocarbons, and other pollutants react with one another in the presence of sunlight. |
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| a layer of warm air prevents the rising air from escaping. the polluted air is trapped and held close to Earth's surface. The smog becomes more concentrated and dangerous. |
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| rain that is more acidic than normal, caused by the release of molecules of sulfur dioxide and nitrogen oxide into the air. |
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| the amount of mass in a given space; mass per unit volume. |
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| the amount of force pushing on a surface or area. |
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| a force that is the result of the weight of a column of air pushing down on an area |
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| an instrument used to measure changes in air pressure. |
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| an instrument that measures changes in the air pressure, consisting of a glass tube part filled with mercury, with its open end resting in a dish of mercury. Air pressure pushing on the mercury in the dish forces the mercury int the tube higher. |
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| an instrument that measures changes in air pressure without using a liquid. Changes in the shape of an airtight metal box causes a needle on the barometer dial to move. |
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| elevation above sea level. |
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| the lowest layer of earth's atmosphere, where weather occurs. |
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| the second-lowest layer of earth's atmosphere; the ozone layer is located in the upper stratosphere. |
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| the middle layer of earth's atmosphere; the layer in which most meteroids burn up. |
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| the lowest layer part of the thermosphere, where electrically chareged particals called ions are found. |
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| a colorful, glowing display in the sky caused when particals from the sun strike oxygenand nitrogen atoms in the ionosphere; also called the northern lights. |
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| the outer layer of the thermosphere, extending outward into space. |
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