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boulder, in geology
(Encyclopedia) boulder, large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is…glacial periods
(Encyclopedia) glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods…Valday Hills
(Encyclopedia) Valday Hills or Valdai HillsValday Hillsboth: väldīˈ, Rus. vəldīˈ [key], upland region, NW European Russia, composed of a series of glacial moraines that rise to c.1,100 ft (340 m).…Pleistocene epoch
(Encyclopedia) Pleistocene epochPleistocene epochplīˈstəsēn [key], 6th epoch of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table). According to a…kame
(Encyclopedia) kamekamekām [key], low, steep, rounded hill or ridge of layered sand and gravel drift, developed from glacial deposits. Kames were probably formed by streams of melting glacial ice…glacier
(Encyclopedia) glacier, moving mass of ice that survives year to year, formed by the compacting of snow into névé and then into granular ice and set in motion outward and downward by the force of…waterfall
(Encyclopedia) waterfall, a sudden unsupported drop in a stream. It is formed when the stream course is interrupted as when a stream passes over a layer of harder rock—often igneous—to an area of…Riding Mountain National Park
(Encyclopedia) Riding Mountain National Park, 1,148 sq mi (2,973 sq km), SW Man., Canada, W of Lake Manitoba; est. 1929. A wooded region with small glacial lakes, on the highest part of the Manitoba…Agassiz, Lake
(Encyclopedia) Agassiz, LakeAgassiz, Lakeăgˈəsē [key], glacial lake of the Pleistocene epoch, c.700 mi (1,130 km) long, 250 mi (400 km) wide, formed by the melting of the continental ice sheet…varve
(Encyclopedia) varve, in geology, pair of thin sedimentary layers formed annually by seasonal climatic changes. Usually found in glacial lake deposits, varves consist of a coarse-grained, light-…Trending
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