a. A long, straight, commonly U-shaped valley or depression between two mountain ranges. AGI
b. A narrow, steep-sided canyon, gully, or other depression eroded by a stream. AGI
c. Any long, narrow cut or excavation produced naturally in the Earth's surface by erosion or tectonic movements. Also, a similar feature produced artificially, such as a ditch dug in prospecting for minerals. AGI
d. An elongated but proportionally narrow depression, with steeply sloping longitudinal borders, one of which (the continental) rises higher than the other (the oceanic). Trenches are the ends of unsymmetrical basins and lie beside the continental border or island chains. Syn: marginal trench AGI
e. A long but narrow depression of the deep-sea floor having relatively steep sides. AGI
f. A long, narrow, intermontane depression occupied by two or more streams (whether expanded into lakes or not), alternately draining the depression in opposite directions. AGI
g. A narrow ditch. AGI
h. In geological exploration, a narrow, shallow ditch cut across a mineral deposit to obtain samples or to observe character.
i. A long, narrow excavation in the ground, as a trench dug for the laying of pipes. Crispin
j. A temporary scar in which a conduit is placed and then covered over. CF: ditch
Source:
Dictionary of Mining, Mineral, and Related Terms












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