SpeciationMicroevolution and MacroevolutionIntroductionMicroevolutionSpeciationMacroevolution According to the theory of natural selection, speciation is the creation of new species by genetic…
(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…
(Encyclopedia) PatagoniaPatagoniapätägōˈnyä [key], region, c.300,000 sq mi (777,000 sq km), primarily in S Argentina, S of the Río Colorado and E of the Andes, but including extreme SE Chile and N…
(Encyclopedia) SulawesiSulawesis&oomacr;ˌläwāˈsē [key], formerly CelebesSulawesisĕlˈəbēz [key], island (1990 pop. 12,511,163), c.73,000 sq mi (189,070 sq km), largest island in E Indonesia, E of…
(Encyclopedia) Venus, in astronomy, 2d planet from the sun; it is often called the evening star or morning star and is brighter than any object in the sky except the sun and the moon. Because its…
(Encyclopedia) AndesAndesănˈdēz [key], mountain system, more than 5,000 mi (8,000 km) long, W South America. The ranges run generally parallel to the Pacific coast and extend from Tierra del Fuego…
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Plate tectonics: Map of the world showing major plates and plate boundaries
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Plate tectonics: Schematic model of the oceanic crust, showing the three types of plate…
“Mothers of the Earth,” “Queens of the Universe,” “Queens of the Heavens,” all are goddesses believed to be creators, lawmakers, prophets, healers, hunters, battle leaders, and truth-givers. Let…
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GrenadaGrenadagrĭnāˈdə [key], independent state within the Commonwealth of Nations (2015 est. pop. 107,000), 133 sq mi (344 sq km), in the Windward Islands, West Indies. The…
