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sandstone

(Encyclopedia) sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness…

opal

(Encyclopedia) opalopalōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is…

500 Songs That Shaped Rock

James Henke, chief curator for the Rock and Roll Hall of Fame, with the help of music writers and critics, selected 500 songs (not only rock songs) that they believe have been most…

Is the Red Sea red?

The Question: Is the Red Sea red? If so, why? The Answer: Of course it's not actually red, but sometimes it appears that way. Located between the East African coast and the Saudi Arabian…

pigment

(Encyclopedia) pigment, substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface. The…

oxpecker

(Encyclopedia) oxpecker, common name for an African starling of the genus Buphagus. Also known as tickbirds, oxpeckers have very short legs and sharp claws, which aid them in perching on the backs of…

Snow-White and Rose-Red

Snow-White and Rose-Red There was once a poor widow who lived in a lonely cottage. In front of the cottage was a garden wherein stood two rose-trees, one of which bore white and the other red…

Prince

(Encyclopedia) Prince, 1958–2016, American singer and songwriter, b. Minneapolis, Minn., as Prince Rogers Nelson. Biracial, slim, and sexily androgynous, he was an electrifying performer who composed…

Gold Butte National Monument

(Encyclopedia) Gold Butte National Monument, 296,937 acres (90,506 hectares), SE Utah, est. 2016 and managed by the Bureau of Land Management. Named for a mining ghost town, the monument embraces a…