• Professor, Department of Civil, Geological and Environmental Engineering and School of Environment and Sustainability, University of Saskatchewan
Groundwater is used for irrigation and drinking water, but those wells are rarely more than one kilometre deep. A huge volume of salty water exists as much as 10 kilometres below the Earth’s surface. (Shutterstock)

Groundwater — not ice sheets — is the largest source of water on land and most of it is ancient

Groundwater is the second-largest store of water on Earth. Governments and industry use groundwater reservoirs to store waste, but it may also have environmental functions that haven’t been revealed.

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