Approximately 90 percent of the total atmospheric water vapor is found in the troposphere. This concentration occurs because moisture enters the air through evaporation and transpiration at the Earth’s surface. Gravity and the cooling effect of altitude keep this water trapped in the lowest layer, where it forms clouds and drives the weather patterns essential for all terrestrial life. ANSWER: (D) Troposphere
In which part of the atmosphere is 90 percent of the total amount of water vapor present? (A) Ozone sphere (B) Stratosphere (C) Ionosphere (D) Troposphere
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The troposphere contains about ninety percent of all the water vapor in the entire atmosphere. This is due to the fact that the source of all atmospheric moisture—oceans, lakes and plants—is at ground level. As moisture evaporates, it rises, but the decreasing temperatures at higher altitudes cause it to condense into clouds and eventually fall back as precipitation. This constant cycling ensures that the water remains concentrated in the lowest layer. The upper layers, like the stratosphere and mesosphere, are extremely dry by comparison, which is why weather and clouds are almost entirely tropospheric phenomena.
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