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stratigraphy
(Encyclopedia) stratigraphy, branch of geology specifically concerned with the arrangement of layered rocks (see stratification). Stratigraphy is based on the law of superposition, which states that…Led Zeppelin
(Encyclopedia) Led Zeppelin, English pop music group formed in 1968 by guitarist Jimmy Page (1944–), singer Robert Plant (1948–), bassist John Paul Jones (1946–), and drummer John “Bonzo” Bonham (…Holly, Buddy
(Encyclopedia) Holly, Buddy, 1936–59, American rock singer, songwriter, and guitarist, b. Lubbock, Tex., as Charles Hardin Holley. He performed country…pyroclastic flow
(Encyclopedia) pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of…taconite
(Encyclopedia) taconite, low-grade iron ore, a flintlike rock usually containing less than 30% iron. Resistant to drilling and to the extraction of its contained metal, the rock was long considered…Garden of the Gods
(Encyclopedia) Garden of the Gods, park, 770 acres (312 hectares), central Colo., near Colorado Springs; noted for its unusual, multicolored rock formations. Narrow-crested sandstone hills and ridges…porphyry, igneous rock
(Encyclopedia) porphyryporphyrypôrˈfərē [key], igneous rock composed of large, conspicuous crystals (phenocrysts) and a groundmass in which the phenocrysts are embedded. Some authorities consider the…music video
(Encyclopedia) music video, videotaped performance of a recorded popular song, usually accompanied by dance or a fragmentary story and sometimes employing concert footage. Typically three to five…Paleolithic art
(Encyclopedia) Paleolithic artPaleolithic artpāˌlēəlĭthˈĭk, –lēō–, pălˌ– [key], art produced during the Paleolithic period. Study and knowledge of this art largely have been confined to works…pitta
(Encyclopedia) pittapittapĭtˈə [key], name used to refer to a genus (Pitta) of small, plump, brightly colored birds. The genus, including some twenty-three species, constitutes the whole of the…Trending
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