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avalanche
(Encyclopedia)avalanche, rapidly descending large mass of snow, ice, soil, rock, or mixtures of these materials, sliding or falling in response to the force of gravity. Avalanches, which are natural forms of erosio...Sevan
(Encyclopedia)Sevan syĭvänˈ [key], lake, c.540 sq mi (1,400 sq km), NE Armenia, at an altitude of 6,280 ft (1,914 m); it is 324 ft (99 m) deep. The largest lake of the Caucasus, it is fed by some 30 streams, but...Sault Sainte Marie Canals
(Encyclopedia)Sault Sainte Marie Canals, two ship canals bypassing the rapids on the St. Marys River between Lake Superior and Lake Huron, at the cities of Sault Ste Marie, Mich. and Ont. The Canadian canal (1.4 mi...roller skating
(Encyclopedia)roller skating, gliding on a hard, smooth, durable surface on skates with rollers or wheels, in recent years has become a popular adult sport. Skates mounted on wooden rollers date from the 1860s, and...Scott, Robert Falcon
(Encyclopedia)Scott, Robert Falcon, 1868–1912, British naval officer and antarctic explorer. He commanded two noted expeditions to Antarctica. The first expedition (1901–4), in the Discovery, organized jointly ...sediment
(Encyclopedia)sediment, mineral or organic particles that are deposited by the action of wind, water, or glacial ice. These sediments can eventually form sedimentary rocks (see rock). Sediments form sedimentary ...snow
(Encyclopedia) CE5 Snow occurs in many different forms. Among the various recognized classes of forms are (A) needles; (B) columns and groups of columns; (C) plates; (D) branched, or dendritic, plates; (E) combin...Fuchs, Sir Vivian Ernest
(Encyclopedia)Fuchs, Sir Vivian Ernest fo͝oks [key], 1908–99, English geologist and explorer, b. Kent, educated at Cambridge. He was a geologist on expeditions to Greenland (1929) and to Africa (1930–38). Afte...Geikie, Sir Archibald
(Encyclopedia)Geikie, Sir Archibald gēˈkē [key], 1835–1924, British geologist, educated at the Univ. of Edinburgh. He joined the Geological Survey of Scotland, becoming its director in 1867. He was professor o...Mauna Kea
(Encyclopedia)Mauna Kea mouˈnə kāˈə [key], dormant volcano, 13,796 ft (4,205 m) high, in the south central part of the island of Hawaii. It is the loftiest peak in the Hawaiian Islands and the highest island m...Browse by Subject
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