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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 in a normal sequ...

Curtis, Charles

(Encyclopedia)Curtis, Charles, 1860–1936, Vice President of the United States (1929–33), b. near North Topeka, Kans. Of part Native American background, Curtis lived for three years on a Kaw reservation. After ...

Turan

(Encyclopedia)Turan to͞oränˈ [key], desert lowland, shared by Kazakhstan, Uzbekistan, and Turkmenistan, S and E of the Aral Sea. The Amu Darya and Syr Darya rivers divide it into the Kara Kum desert in the south...

Holly, Buddy

(Encyclopedia)Holly, Buddy, 1936–59, American rock singer, songwriter, and guitarist, b. Lubbock, Tex., as Charles Hardin Holley. He performed country and western m...

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 (1948–80...

earth, in geology and astronomy

(Encyclopedia)CE5 A. Cross section of the earth, showing its shells B. Detailed cross section of the crust and upper mantle: The lithosphere consists of the hard rock in the crust and upper mantle, lying above t...

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 rock fragments ran...

Ursa Major and Ursa Minor

(Encyclopedia)Ursa Major ûrˈsə [key] and Ursa Minor [Lat.,=the great bear; the little bear], two conspicuous northern constellations. Known to many peoples from ancient times, these constellations have had vario...

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 worthless. Experi...

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 have been erode...