Unit4 Key Terms 0.0 / 5 ? GeologyEnvironmental GeologyA2/A-levelOCR Created by: Gabby-ACreated on: 23-05-16 11:16 Porosity The amount of pore space in a rock (%porosity = [total volume of pore space / total volume of rock] x100) 1 of 22 Permeability The ability of a rock to transmit fluids (permeability = distance water has traveled / time taken) 2 of 22 Groundwater The water retained in the pore space of rocks below the water table 3 of 22 Water Table The surface separating unsaturated rock above from saturated rock below 4 of 22 Hydrostatic Pressure The pressure at a point in a body of water due to the weight of the overlying column of water 5 of 22 Aquifer A body of porous and permeable rock capable of storing and yielding significant amounts of water 6 of 22 Aquiclude An impermeable rock that does not transmit water 7 of 22 Recharge Zone The area of an aquifer open to the atmosphere, allowing replenishment of water 8 of 22 Draw Down Describes the height difference between the water table and water level in the well 9 of 22 Cone Of Depression Occurs where there is a lowering of the water table in the vicinity of a well 10 of 22 Trap A geological situation that concentrates petroleum in one place 11 of 22 (Natural) Resource Any (natural) material that is useful and valuble 12 of 22 Reserve The amount of the resource that can be extracted at a profit 13 of 22 Ore The rock containing valuble metal(s) that is economic to mine 14 of 22 Ore Mineral A mineral containing valuble metal(s) 15 of 22 Gangue Mineral A low-value waste mineral 16 of 22 Average Crustal Abundance Describes the amount of metal in average continental crust 17 of 22 Cut Off Grade The minimum grade that is economic to mine 18 of 22 Concentration Factor The amount by which the metal is concentrated to make an ore deposit 19 of 22 Hydrothermal Fluid A hot, aqueous fluid containing dissolved metals in solution 20 of 22 Geochemical Anomaly A concentration of a metal above it's normal background value 21 of 22 Leachate The fluid generated by water dissolving soluble chemicals from landfill waste 22 of 22
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