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snowball earth

(Encyclopedia)snowball earth, hypothesized condition in which the earth was covered completely by ice during several periods in the Proterozoic. The hypothesis was originally developed to explain evidence of the co...

Kara Sea

(Encyclopedia)Kara Sea kärˈə [key], Rus. Karskoye More, shallow section of the Arctic Ocean, off N Russia, between Severnaya Zemlya and Novaya Zemlya. It has an average depth of 420 ft (128 m). It receives the O...

kettle

(Encyclopedia)kettle, oval depression found in glacial moraines, which are landforms made up of rock debris. When a glacier melts and draws away from an area, a block of ice may break off and be covered by earth an...

Enceladus

(Encyclopedia)Enceladus ĕnsĕlˈədəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn II (or S2), Enceladus is 310 mi (500 km) in diameter, orbits Saturn at a m...

Tikhonov, Viktor Vasilyevich

(Encyclopedia)Tikhonov, Viktor Vasilyevich, 1930–2014, Soviet and Russian ice hockey player and coach, b. Moscow. As a defenseman (1949–63), he won four national championships (1951–54) with the Soviet air fo...

Arctic, the

(Encyclopedia)CE5 Arctic, the northernmost area of the earth, centered on the North Pole. The arctic regions are not coextensive with the area enclosed by the Arctic Circle (lat. 66°30′N) but are usually defi...

Seward

(Encyclopedia)Seward, city (1990 pop. 2,699), Kenai Peninsula borough, S Alaska, on Kenai Peninsula, at the head of Resurrection Bay; inc. 1912. It was founded in 1902 as the ocean terminus of the Alaska RR (built ...

Meager, Mount

(Encyclopedia)Meager, Mount, volcano, 8,793 ft (2,680 m) high, SW British Columbia, Canada, 90 mi (150 km) N of Vancouver. It is the northernmost of the Cascade Range volcanoes and the second highest peak of the Mo...

sunspots

(Encyclopedia)sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surro...

Monte Albán

(Encyclopedia)Monte Albán mōnˈtā älbänˈ [key], ancient city, c.7 mi (11.3 km) from Oaxaca, SW Mexico, capital of the Zapotec. Monte Albán was built on an artificially leveled, rocky promontory above the Val...