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hydrogen

(Encyclopedia)hydrogen hīˈdrəjən [key] [Gr.,=water forming], gaseous chemical element; symbol H; at. no. 1; interval in which at. wt. ranges 1.00784–1.00811; m.p. −259.14℃; b.p. −252.87℃; density 0.08...

Arctic Ocean

(Encyclopedia)Arctic Ocean, the smallest ocean, c.5,400,000 sq mi (13,986,000 sq km), located entirely within the Arctic Circle and occupying the region around the North Pole. The Arctic basin was almost wholly u...

sulfuric acid

(Encyclopedia)sulfuric acid, chemical compound, H2SO4, colorless, odorless, extremely corrosive, oily liquid. It is sometimes called oil of vitriol. Although sulfuric acid is now one of the most widely used c...

Neptune, in Roman religion and mythology

(Encyclopedia)Neptune, in Roman religion and mythology, god of water. He was presumably an indigenous god of fertility, but in later times he was identified with the Greek Poseidon, god of the sea. At his festival,...

Aa, in European place names

(Encyclopedia)Aa ä [key] [from a word for “water” of the same Indo-European root as Lat. aqua], name of many small streams of N Europe and Switzerland. Aa, or a derivative of it, is a component part of hundred...

Conchos

(Encyclopedia)Conchos kōnˈchōs [key], river, c.350 mi (560 km) long, rising in S Chihuahua state, N Mexico, and flowing N and NE to the Rio Grande. Dams along its middle course provide water for extensive cotton...

Ctesibius

(Encyclopedia)Ctesibius tĭsĭbˈēəs [key], fl. 2d cent. b.c., Alexandrian Greek inventor. He reputedly was the first to discover and apply the expansive power of air as a motive force. Among the inventions ascri...

Geneva, city, United States

(Encyclopedia)Geneva, city (2020 pop. 12,812), Ontario co., W central N.Y., in the Finger Lakes region; inc. as a city 1897. Located in a farm area, Geneva's manufact...

Des Moines, river, United States

(Encyclopedia)Des Moines, river, 535 mi (861 km) long, rising in SW Minn. and flowing SE across Iowa to the Mississippi River at Keokuk, SE Iowa. Flowing through fertile farmland, the river floods in the spring and...

varve

(Encyclopedia)varve, in geology, pair of thin sedimentary layers formed annually by seasonal climatic changes. Usually found in glacial lake deposits, varves consist of a coarse-grained, light-colored summer deposi...