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schistosomiasis
(Encyclopedia)schistosomiasis bĭlˌhärzīˈəsĭs [key], or snail fever, parasitic disease caused by blood flukes, trematode worms of the genus Schistosoma. Three species are human parasites: S. mansoni, S. japon...sea urchin
(Encyclopedia)sea urchin, spherical-shaped echinoderm with movable spines covering the body. The body wall is a firm, globose shell, or test, made of fused skeletal plates and marked by regularly arranged tubercles...acid rain
(Encyclopedia)acid rain or acid deposition, form of precipitation (rain, snow, sleet, or hail) containing high levels of sulfuric or nitric acids (pH below 5.5–5.6). Produced when sulfur dioxide and various nitro...South Island
(Encyclopedia)South Island or Te Waipounamu [Maori,=the waters of greenstone] (1996 pop. 900,114), 58,093 sq mi (150,461 sq km), New Zealand. It is the larger but less populous of the two principal islands of the c...Osiris
(Encyclopedia)Osiris ōsīˈrĭs [key], in Egyptian religion, legendary ruler of predynastic Egypt and god of the underworld. He was the son of the sky goddess Nut and the earth god Geb. The great benefactor of man...marine biology
(Encyclopedia)marine biology, study of ocean plants and animals and their ecological relationships. Marine organisms may be classified (according to their mode of life) as nektonic, planktonic, or benthic. Nektonic...pompano
(Encyclopedia)pompano pŏmˈpənō [key], common name for fishes of the genus Trachinotus, members of a large and important family (Carangidae) of mackerellike fishes, abundant in warm seas around the world. They h...grebe
(Encyclopedia)grebe grēb [key], common name for swimming birds found on or near quiet waters in most parts of the world. Grebes resemble the loon and the duck; they have short wings, vestigial tails, and long, ind...Jordan, river, Asia
(Encyclopedia)Jordan, river, c.200 mi (320 km) long, formed in the Hula basin, N Israel, by the confluence of three headwater streams and meandering S through the Sea of Galilee to the Dead Sea; the region of Pales...motorboating
(Encyclopedia)motorboating, sport of navigating a motor-powered vessel on the water. It is done on either fresh- or saltwater and may be competitive or recreational. The first successful motorboat traveled (1887) a...Browse by Subject
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