geologyfinalterms

geologyfinalterms - Liquid Waste pp 371-379...

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Liquid Waste? pp. 371-379 Radon/Radioactive Waste pp. 380-391 Half-life – the length of time required for half of an initial quantity of a radioactive isotope in decay. Low-level waste – wastes that are sufficiently low in radioactivity that they can be released safely into the environment or disposed of with minimal precautions. High level waste – waste sufficiently radioactive to require special handling in disposal. Multiple barrier (multibarrier) concept - Transuranic wastes – describes elements with atomic numbers higher than that of uranium, none of which occur naturally on earth, and all of which are radioactive. Wonderful Water/Ground Water pp. 228-257 Porosity – the proportion of void space in the material- holes or cracks, unfilled by solid material, within or between individual material grains- and is a measure of how much fluid the material can store. Permeability – a measure of how readily fluids pass through the material. Saturated zone – or phreatic zone. Ground water is the water in the saturated zone. Unsaturated zone – or vadose zone. The water in unsaturated soil is soil moisture, and is often an important factor in agricultural productivity. Soil moisture – the water in unsaturated soil is soil moisture, and is often an important factor in agricultural production. Water table – the top of the saturated zone, where the saturated zone is not confined by overlying impermeable rocks. Recharge – the processes of infiltration and migration or percolation by which ground water is replaced are collectively called recharge. Discharge – groundwater discharge occurs where ground water flows into a stream, escapes at the surface of a spring, or otherwise exits the aquifer. The term can also apply to the water moving through an aquifer. Aquifer – a rock that holds enough water and transmits it rapidly enough to be useful as a source of water is an aquifer. Many of the best aquifers are sandstone or other coarse clastic sedimentary rocks, but any other type of rock may Aquitard – a rock that may store a considerable quantity of water, but in which water flow is slowed, or retarded; that is, its permeability is low, regardless of its porosity.
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