causes cooling, which ultimately results in condensation, releasing again the energy
that was required to evaporate the water initially. Fortunately, the water vapors do
not rise in the atmosphere indefinitely. About 50% of the water condenses before it
reaches 1.6 km (1 mi) altitude. About 4% remains at 6 km (4 mi) and essentially none
has been observed above 20 km (12 mi). Therefore, the water vapor does not escape
the earth’s atmosphere.
Fig. 6.1 The hydrologic cycle [2]
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that was required to evaporate the water initially. Fortunately, the water vapors do
not rise in the atmosphere indefinitely. About 50% of the water condenses before it
reaches 1.6 km (1 mi) altitude. About 4% remains at 6 km (4 mi) and essentially none
has been observed above 20 km (12 mi). Therefore, the water vapor does not escape
the earth’s atmosphere.
Fig. 6.1 The hydrologic cycle [2]
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237