Statement (A) is false because water vapor concentration decreases as altitude increases. Most atmospheric moisture originates from surface evaporation and remains trapped within the lower troposphere. As air rises and cools, its capacity to hold moisture drops, causing water to condense and precipitate. Consequently, the higher layers of the atmosphere are extremely dry compared to the humid air found at ground. ANSWER: (A) The amount of water vapor increases with increasing altitude.
Which of the following statements is false? (A) The amount of water vapor increases with increasing altitude. (B) The lower layers of the atmosphere are dominated by heavier gases and the upper layers by lighter gases. (C) The upper limit of the atmosphere is approximately 10,000 km. (D) 50% of the atmosphere is confined to an altitude of 5.6 km.
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The assertion that water vapor increases with altitude is incorrect because moisture levels are highest at the surface. Water vapor enters the atmosphere through evaporation from oceans and transpiration from plants, both occurring at ground level. As air parcels rise, they experience lower pressure and colder temperatures, leading to condensation into clouds. Therefore, about 90% of all atmospheric water vapor is found within the lowest 5 kilometers. In the upper layers, such as the stratosphere and beyond, the air is nearly devoid of moisture. Understanding this vertical distribution is essential for meteorology, as it dictates global weather patterns and precipitation.
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