phreatic
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Phreatic — Phre*at ic, a. [F. phr[ e]atique, from Gr. ?, ?, a well.] (Geol.) Subterranean; applied to sources supplying wells. [1913 Webster] … The Collaborative International Dictionary of English
phreatic — [frē at′ik] adj. Geol. of, having to do with, or being groundwater … English World dictionary
Phreatic — The term phreatic is used in Earth sciences to refer to matters relating to ground water below the static water table (the word originates from the Greek phrear , phreat meaning well or spring ). The term phreatic surface is where the hydrostatic … Wikipedia
phreatic — /free at ik/, adj. Geol. 1. noting or pertaining to ground water. 2. noting or pertaining to explosive volcanic activity involving steam derived from ground water: a phreatic explosion. [1890 95; < Gk phreat (s. of phréar) artificial well + IC] * … Universalium
phreatic cave — 1. Cave conceived and developed by dissolution, usually below the water table, where all voids are water filled within the phreas. Phreatic caves may include loops deep below the water table, particularly in dipping limestone with widely… … Lexicon of Cave and Karst Terminology
Phreatic eruption — A Phreatic eruption, also called an ultravulcanian eruption, occurs when rising magma makes contact with ground or surface water. The extreme temperature of the magma (anywhere from 600 °C to 1,170 °C (1110–2140 °F)) causes near instantaneous… … Wikipedia
phreatic eruption — ALASKA VOLCANO OBSERVATORY GLOSSARY An explosive volcanic eruption caused when water and heated volcanic rocks interact to produce a violent expulsion of steam and pulverized rocks. Magma is not involved. GLOSSARY OF VOLCANIC TERMS A steam… … Glossary of volcanic terms
Phreatic zone — The phreatic zone (from Ancient Greek phrear, phreat a well ), or zone of saturation, is the area in an aquifer, below the water table, in which relatively all pores and fractures are saturated with water. The phreatic zone may fluctuate with… … Wikipedia
phreatic water — That part of the underground water in a karst limestone which lies within the zone of permanently saturated rock the phreatic zone. Caves formed within this zone are known as phreatic caves [19]. See phreas … Lexicon of Cave and Karst Terminology
phreatic lift — An active or abandoned phreatic conduit that carries or carried water upwards in a downstream direction [9] … Lexicon of Cave and Karst Terminology
phreatic zone — 1. Those parts of the earth’s crust in which all voids are filled with water under pressure greater than atmospheric [22]. 2. That part of the earth’s crust beneath the regional water table in which all voids, large and small, are ideally… … Lexicon of Cave and Karst Terminology
