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Atlin Lake
(Encyclopedia) Atlin LakeAtlin Lakeătˈlĭn [key], long, irregular mountain lake, c.300 sq mi (780 sq km), NW British Columbia, Canada, touching the Yukon boundary. It is the source of the Yukon River…carboloy
(Encyclopedia) carboloycarboloykärˈbəloi [key] [portmanteau word from carbon and alloy], an alloy containing cobalt, tungsten, and carbon. This alloy is extremely hard, harder than steel; it is used…silica
(Encyclopedia) silica or silicon dioxide, chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white.…astrobleme
(Encyclopedia) astroblemeastroblemeăsˈtrōblēmˌ [key], large, circular structure ranging from c.1&fslsh;2 mi to 40 mi (.8–64 km) in diameter. Astroblemes are found at numerous places on the earth'…silt
(Encyclopedia) silt, predominantly quartz mineral particles that are between sand size and clay size, i.e., between 1&fslsh;16 and 1&fslsh;256 mm (1&fslsh;406 –1&fslsh;6502 in.) in…rhyolite
(Encyclopedia) rhyolite, fine-grained light-colored acidic volcanic rock. Rhyolite is chemically the equivalent of granite, and is thus composed primarily of quartz and orthoclase feldspar with…syenite
(Encyclopedia) syenitesyenitesīˈənīt [key], coarse-grained igneous rock, similar in appearance and composition to granite. Unlike granite, it contains little or no quartz. The chief minerals in…molybdenite
(Encyclopedia) molybdenitemolybdeniteməlĭbˈdənīt, mō– [key], a mineral, molybdenum disulfide, MoS2, blue-gray in color, with a metallic luster and greasy feel. It occurs in crystals of the hexagonal…chronometer
(Encyclopedia) chronometerchronometerkrənŏmˈətər [key], instrument for keeping highly accurate time, used especially in navigation. Before the advent of radio time signals it was the only device that…sand
(Encyclopedia) sand, rock material occurring in the form of loose, rounded or angular grains, varying in size from .06 mm to 2 mm in diameter, the particles being smaller than those of gravel and…Trending
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