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limestone
(Encyclopedia) limestone, sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red…Atlas Mountains
(Encyclopedia) Atlas Mountains, system of ranges and plateaus in NW Africa, extending c.1,500 mi (2,410 km) from SW Morocco, through N Algeria, to N Tunisia; Jebel Toubkal (13,671 ft/4,167 m), in SW…foraminiferan
(Encyclopedia) foraminiferanforaminiferanfərămˌənĭfˈərən [key], common name for members of the class Foraminifera, large, shelled ameboid protozoans belonging to the phylum Sarcodina. Most…How Old Is the Grand Canyon?
The Grand Canyon may be 10 million years older than we thought by Liz Olson Visit our Grand Canyon Slideshow.Photo of the Grand Canyon courtesy of Carol M. Highsmith…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…Cambrian period
(Encyclopedia) Cambrian period [Lat. Cambria=Wales], first period of the Paleozoic geologic era (see Geologic Timescale, tablegeologic timescale, table) extending from approximately 570 to 505…Smelliest Plant
Rafflesia arnoldii Each bloom can be as big as 3 feet wide and can weigh up to 24 pounds. The reddish-brown flower, which emits a revolting odor, is found in Southeast Asia (primarily Borneo and…March 2004
WorldPutin Appoints Prime Minister (March 1): Russian president names Mikhail Fradkov as premier. (March 14): Putin overwhelmingly reelected to a second term. Suicide Bombers Hit Iraqi…Principal Deserts of the World
Deserts are arid regions, generally receiving less than ten inches of precipitation a year, or regions where the potential evaporation rate is twice as great as the precipitation. The world'…fossil
(Encyclopedia) fossil, remains or imprints of plants or animals preserved from prehistoric times by the operation of natural conditions. Fossils are found in sedimentary rock, asphalt deposits, and…Trending
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