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| Description: Groundwater = precipitation that does not evaporate, flow into waterways, or get taken up by organisms Aquifers = Porous sponge-like formations of rock, sand, or gravel that hold groundwater Zone of aeration = spaces are partially filled with water Zone of saturation = spaces are completely filled with water Water table = boundary between the two zones Aquifer recharge zone = any area where water infiltrates Earth’s surface and reaches aquifers Confined or artesian = water-bearing, porous rocks are trapped between layers of less permeable substrate (i.e., clay) Is under a lot of pressure Unconfined aquifer = no upper layer to confine it Readily recharged by surface water Groundwater becomes surface water through springs or human-drilled wells Groundwater may be ancient: the average age is 1,400 years Picture Stats: Views: 226 Filesize: 187.14kB Height: 880 Width: 1095 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35830 |