An underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, or silt) from
which groundwater can be extracted using a well.
A process in which carbon dioxide (CO2) emissions from power plants and other sources
are captured and stored underground, rather than being released into the atmosphere.
A method of separating gold or other valuable minerals from sediment by swirling the sediment in a pan and
separating the heavier minerals from the lighter ones.