Evaporation Evaporation 320,000 km³ Oceans Hydrologic Cycle Precipitation Precipitation 96,000 km³ Precipitation 284,000 km³ Evaporation/Transpiration 60,000 km³ Runoff 36,000 km³ Runoff Infiltration
1. Globally, from which source does more water evaporate into the atmosphere: oceans or land?
2. Approximately what percentage of the total water evaporated into the atmosphere comes from the oceans?
Percentage from oceans = Ocean evaporation/Total evaporation × 100% = _____ %
3. Notice in Figure 8.1 that more water evaporates from the oceans than is returned directly by precipitation. If sea level is not dropping, identify a source of water for the oceans in addition to precipitation.
4. Worldwide, about how much of the precipitation that falls on the land becomes runoff: 35, 55, or 75 percent?
5. Much of the water that falls on land does not immediately return to the ocean via runoff. Instead, it is temporarily stored in reservoirs such as lakes. In some mountainous and polar regions, what features serve as reservoirs to temporarily store water?
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