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sodium sulfate
(Encyclopedia) sodium sulfate, chemical compound, Na2SO4. It is a white, orthorhombic crystalline compound at ordinary temperatures; above 100℃ it assumes a monoclinic structure, and above about 250…excretion
(Encyclopedia) excretion, process of eliminating from an organism waste products of metabolism and other materials that are of no use. It is an essential process in all forms of life. In one-celled…fjord
(Encyclopedia) fjord or fiordfjordfyôrd [key], steep-sided inlet of the sea characteristic of glaciated regions. Fjords probably resulted from the scouring by glaciers of valleys formed by any of…feather star
(Encyclopedia) feather star, common name of a class of echinoderms that, as juveniles, are attached to the sea bottom by a stalk with rootlike branches; the mouth side faces upward. In the adult…cork, in botany
(Encyclopedia) cork, protective, waterproof outer covering of the stems and roots of woody plants. Cork is a specialized secondary tissue produced by the cork cambium of the plant (see meristem, bark…Tantalus
(Encyclopedia) TantalusTantalustănˈtələs [key], in Greek mythology, king of Sipylos, son of Zeus and father of Pelops and Niobe. He was admitted to the society of the gods, but his abominable…tidal wave
(Encyclopedia) tidal wave, term properly applied to the crest of a tide as it moves around the earth. The wavelike upstream rush of water caused by the incoming tide in some locations is known as a…whirlpool
(Encyclopedia) whirlpool, revolving current in an ocean, river, or lake. It may be caused by the configuration of the shore, irregularities in the bottom of the body of water, the meeting of opposing…baths
(Encyclopedia) baths, in architecture. Ritual bathing is traceable to ancient Egypt, to prehistoric cities of the Indus River valley, and to the early Aegean civilizations. Remains of bathing…swim bladder
(Encyclopedia) swim bladder, large, thin-walled sac in some fishes that may function in several ways, e.g., as a buoyant float, a sound producer and receptor, and a respiratory organ. The swim…Trending
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