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OUR ATMOSPHERE

C2

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Across
3.pollution that can be traced to one specific place
7.transfer of heat due to movement of heated matter
8.process by which energy is given off in waves oe waves
9.a form of oxygen found in the atmosphere which absorbs harmful solar radiaition
12.pollutants trapped in the air by temperature inversion
15.the layer that surrounds the earth's surface
16.occurs when a cool layer of air is trapped beneath a warm layer
17.transfer of energy due to collision of molecules
18.an air mass formed near the poles and composed of cold air
19.an air mass that comes from the sea
20.an air mass that comes from over land
Down
1.pollution that cannot obe traced to one specifc location
2.man-made waste which has negative effects on the environment
4.the upper part of the thermosphere
5.the bottom layer of the atmosphere, containing most of its gases
6.a body of air that covers a large surface area
10.the second highest level of the atmosphere, composed mainly of oxygen and nitrogen
11.the uppermost layer of the atmosphere,compsed mainly of hydrogen and helium
13.the lower part of the thermosphere containing charged atoms called ions
14.area of the atmosphere that extends from about 11 to 50 kilometers above the surface

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