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Flathead Lake

(Encyclopedia) Flathead Lake, 197 sq mi (510 sq km), 30 mi (48 km) long, NW Mont.; largest natural lake in Montana. Formed by the glacial damming of the Flathead River, which flows through it from…

Great Glen

(Encyclopedia) Great Glen or Glen More, valley, 60 mi (97 km) long, Highland, N central Scotland, extending from Moray Firth SW to Loch Linnhe. It was formed by a fault in the earth's surface. Loch…

Logan, Mount

(Encyclopedia) Logan, Mount, 19,551 ft (5,959 m) high, in Kluane National Park, extreme SW Yukon, Canada, just E of Alaska; highest mountain in Canada and second highest in North America. One of the…

Buckland, William

(Encyclopedia) Buckland, William, 1784–1856, English geologist. He was dean of Westminster from 1845. First to note in England the action of glacial ice on rocks, he did much to bring physical and…

Bouvet Island

(Encyclopedia) Bouvet IslandBouvet Islandb&oomacr;vāˈ [key], uninhabited volcanic island, c.58 sq mi (150 sq km), S Atlantic Ocean, about 1,600 mi (2,576 km) SW of the Cape of Good Hope. A…

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…

Silurian period

(Encyclopedia) Silurian periodSilurian periodsĭl&oobreve;rˈēən, sī– [key] [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I.…

sidereal period

(Encyclopedia) sidereal period, in astronomy, length of time a body takes to complete an orbit relative to the fixed stars. See sidereal time.

Quaternary period

(Encyclopedia) Quaternary periodQuaternary periodkwətûrˈnərē [key], younger of the two geologic periods of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table)…

synodic period

(Encyclopedia) synodic periodsynodic periodsĭnŏdˈĭk [key], in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the…