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exploration
(Encyclopedia)exploration, travel to a part of the earth that is relatively unknown to the traveler's culture, historically often motivated by a desire for colonization, conquest, or trade. See also space explorati...plate tectonics
(Encyclopedia) CE5 Plate tectonics: Map of the world showing major plates and plate boundaries CE5 Plate tectonics: Schematic model of the oceanic crust, showing the three types of plate boundaries plate tect...Andes
(Encyclopedia)Andes ănˈdēz [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 northward, across t...atmosphere
(Encyclopedia) CE5 Atmosphere atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other plane...Cretaceous period
(Encyclopedia)Cretaceous period krĭtāˈshəs [key], third and last period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), lasting from approximately 144 to 65 millio...whaling
(Encyclopedia)whaling, the hunting of whales for the oil that can be rendered from their flesh, for meat, and for baleen (whalebone). Historically, whale oil was economically the most important. In 1932–33, par...cat
(Encyclopedia)cat, name applied broadly to the carnivorous mammals constituting the family Felidae, and specifically to the domestic cat, Felis catus. The great roaring cats, the lion, tiger, and leopard are anatom...air pollution
(Encyclopedia)air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...international law
(Encyclopedia)international law, body of rules considered legally binding in the relations between national states, also known as the law of nations. It is sometimes called public international law in contrast to p...Norway
(Encyclopedia) CE5 Norway, Nor. Norge, officially Kingdom of Norway, constitutional monarchy (2015 est. pop. 5,200,000), 125,181 sq mi (324,219 sq km), N Europe, occupying the western part of the Scandinavian pen...Browse by Subject
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