glacial
81glacial polish — noun The appearance of rock, after having been worn smooth by a passing glacier. Tenaya Lake was at one time under as much as 2,460 feet of glacial ice that produced a pressure of about 74 tons per square foot and extensive glacial polish (fig.… …
82glacial valley — (also glacial trough) a broad, flat bottomed (U shaped) valley created by glacial erosion and deposition. The erosion widened, deepened and straightened the original river valley. The deposition created the flat bottom …
83glacial groove — A deep, wide, usually straight furrow cut in bedrock by the abrasive action of a rock fragment embedded in the bottom of a moving glacier; it is larger and deeper than a glacial striation, ranging in size from a deep scratch to a small glacial …
84glacial till — (not recommended: use till) Till should only be used for describing glacial sediments, therefore glacial till is redundant. GM …
85glacial-valley floor — The comparatively flat bottom of a mountain valley predominantly mantled by till but which can grade from glacial scour (scoured rock outcrop) near its head to a thick mantle of till, and ultimately merging with alluvium or colluvium further… …
86glacial epoch — /gleɪʃəl ˈipɒk/ (say glayshuhl eepok) noun 1. any of the glaciations of past geological periods as in Australia during the Permian. 2. the glacial epoch, the geologically recent Pleistocene epoch, during which much of the Northern Hemisphere was… …
87Glacial epoch — noun from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution • Syn: ↑Pleistocene, ↑Pleistocene epoch • Instance Hypernyms: ↑epoch • Part Holonyms: ↑Quaternary, ↑ …
88glacial drift — noun : drift 2g(2) * * * Geol. material, as gravel, sand, or clay, transported and deposited by a glacier or by glacial meltwater. Also called drift. Cf. till4. * * * glacial drift, clay, gravel, sand, or other rock material transported or… …
89Glacial phenol — Phenol Phe nol, n. [Gr. ? to show + ol: cf. F. ph[ e]nol.] (Chem.) 1. A white or pinkish crystalline substance, {C6H5OH}, produced by the destructive distillation of many organic bodies, as wood, coal, etc., and obtained from the heavy oil from… …
90Glacial phosphoric acid — Phosphoric Phos*phor ic, a. [Cf. F. phosphorique.] 1. (Chem.) Of or pertaining to phosphorus; resembling, or containing, from us; specifically, designating those compounds in which phosphorus has a higher valence as contrasted with the… …
