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What effect does gravity have on the vertical distribution of gases in the atmosphere?

Answer and explanation

Correct answer: It helps keep most of the atmosphere concentrated near Earth’s surface

Direct answer: C is correct. Gravity attracts atmospheric molecules towards Earth. The weight of the air above compresses the atmosphere most strongly near the surface, where air pressure and density are generally greatest. As altitude increases, there are fewer molecules above a given level, so pressure and density usually decrease. Gases remain mixed through much of the lower atmosphere, but gravity still controls the overall concentration and pressure pattern. A is wrong because gravity holds gases to Earth rather than sending all of them into space. B is wrong because density does not remain exactly constant with height. D is wrong because gravity acts on all atmospheric gases, not only ozone. Memory cue: “More air above means more pressure below.”

Related tags

GravityAir PressureAir DensityVertical DistributionAtmosphereGeographyClass 11Covers The Accounting Equation

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