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Mesozoic era
(Encyclopedia) Mesozoic eraMesozoic eramĕzˌəzōˈĭk [key] [Gr.,=middle life], major division of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 65 to 225 million years ago.…frost
(Encyclopedia) frost or hoarfrost, ice formed by the condensation of atmospheric water vapor on a surface when the temperature of the surface is below 32℉ (0℃). In the formation of frost, a gas (…Microevolution and Macroevolution: Macroevolution
MacroevolutionMicroevolution and MacroevolutionIntroductionMicroevolutionSpeciationMacroevolution Whereas microevolution explains diversification on an individual level over relatively short…ground squirrel
(Encyclopedia) ground squirrel, name applied to certain terrestrial rodents of the squirrel family. In North America the name refers to members of the genus Citellus and sometimes to the closely…wetlands
(Encyclopedia) wetlands, low-lying ecosystem where the water table is always at or near the surface. It is divided into estuarine and freshwater systems, which may be further subdivided by soil type…America's Most Endangered Places 2002
Eleven historic sites in danger of being lost forever In a report released in early June 2002, the National Trust for Historic Preservation (www.nationaltrust.org ) listed 11 historic sites across…Geology of the Grand Canyon: The Permian.
THE TEMPLES AND TOWERS OF THE VIRGEN.THE PERMIAN.The idea of a terrace is not so typically represented in the Permian as it is in the superior formations. In many parts of the great stairway…Climate Change Imperils Future of Several Nations
Dozens of poor nations are threatened by flooding, rising sea levels, crop loss, and the ravaging effects of coastal storms By Beth Rowen An aerial view of…Cretaceous period
(Encyclopedia) Cretaceous periodCretaceous periodkrĭtāˈshəs [key], third and last period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), lasting from…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…Trending
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