1. The Water Cycle By: Yao Yao and Theresa Zajac

2. Atmosphere Storage: 13000 km 3 Ocean Evaporation 434000 km 3 /year Ocean Evaporation 434000 km 3 /year Lands Evaporation 71000 km 3 /year Lands Evaporation 71000 km 3 /year Precipitation to Ocean 398000 km 3 /year Precipitation to Ocean 398000 km 3 /year Precipitation to Lands 107000 km 3 /year Precipitation to Lands 107000 km 3 /year Residence Time=Amount/Flux

3. Surface water Ocean: 1370 million km 3 Ocean: 1370 million km 3 Precipitation 398000 km 3 /y Precipitation 398000 km 3 /y Runoff 36000 km 3 /y Runoff 36000 km 3 /y Evaporation 434000 km 3 /y Evaporation 434000 km 3 /y 3000 years Lakes: 3608600 km 3 Lakes: 3608600 km 3 Precipitation Runoff 42600 km 3 /y Precipitation Runoff 42600 km 3 /y Evaporation Runoff Evaporation Runoff 86 years Rivers: 1700 km 3 Rivers: 1700 km 3 Precipitation Runoff 6800 km 3 /y Precipitation Runoff 6800 km 3 /y Evaporation Runoff Evaporation Runoff 3 months

4. Glaciers, Ice Caps, and Permanent Snow Water source Water volume, in cubic miles Water volume, in cubic kilometers Percent of total water Ice caps, Glaciers, & Permanent snow 5,773,00024,064,0001.7% Total global water332,500,0001,386,000,000-- Source: Gleick, P. H., 1996: Water resources. In Encyclopedia of Climate and Weather, ed. by S. H. Schneider, Oxford University Press, New York, vol. 2, pp.817-823. Melting 11000 km 3 /year Melting 11000 km 3 /year Ice Caps, Glacier, & Perm. Snow: 24,064,000 km 3 Ice Caps, Glacier, & Perm. Snow: 24,064,000 km 3 2188 years

5. Ground Water Water source Water volume, in cubic miles Water volume, in cubic kilometers Percent of total water Groundwater5,614,00023,400,0001.7% Total global water332,500,0001,386,000,000-- Source: Gleick, P. H., 1996: Water resources. In Encyclopedia of Climate and Weather, ed. by S. H. Schneider, Oxford University Press, New York, vol. 2, pp.817-823. Shallow – 100- 200 years Deep – Up to 10,000 years