What approximate percentage of the earth's freshwater is groundwater?
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Groundwater is an important source of freshwater, partly because it accounts for approximately 30% of the Earth's freshwater. Groundwater is an important source of freshwater for areas that do not have access to other sources of freshwater, such as areas that are experiencing droughts. read more
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Where is Earth's water? USGS Water-Science School
water.usgs.gov