(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…
What causes a rainbow? A rainbow in Indiana, Oct. 2015. Source: AP Photo/Michael Conroy Although light looks colorless, it’s made up of many colors-red, orange, yellow, green, blue,…
Source: iStockAfter the death of Queen Elizabeth II, Britain’s late monarch, several processes were put into motion. Once her passing at Scotland’s Balmoral Castle was announced at 6:31 p.m. on…
(Encyclopedia) Aleutian IslandsAleutian Islandsəl&oomacr;ˈshən [key], chain of rugged, volcanic islands curving c.1,200 mi (1,900 km) west from the tip of the Alaska Peninsula and approaching…
