Search

Search results

Displaying 21 - 30

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…

Americus

(Encyclopedia) Americus Americus əmĕrˈĭkəs [key], city (2020 pop. 16,230), seat of Sumter co., SW Ga.; inc. 1855. It is a manufacturing city (polyurethane foam, furniture,…

Brown, Michael Stuart

(Encyclopedia) Brown, Michael Stuart, 1941–, American molecular geneticist, b. New York City, M.D. Univ. of Pennsylvania, 1966. He worked (1968–71) as a researcher at the National Institutes of…

Hoy

(Encyclopedia) Hoy, island, 13 mi (21 km) long and 6 mi (9.7 km) wide, off N Scotland, second largest of the Orkney Islands. It is located at the southwestern side of the Scapa Flow anchorage. Ward…

Cumberland Plateau

(Encyclopedia) Cumberland Plateau or Cumberland Mountains, southwestern division of the Appalachian Mt. system, extending northeast to southwest through parts of West Virginia, Virginia, Kentucky,…