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layer a is the troposphere. it is very important because we breathe air from this layer. it is also important because the water cycle happens via troposphere and greenhouse effect too.

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The study of the troposphere is very important because we breathe the air in this layer of air. ... Tropospheric processes, such as the water or hydrologic cycle (the formation of clouds and rain) and the greenhouse effect, have a great influence on meteorology and the climate.

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