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Annapolis, river, Canada

(Encyclopedia)Annapolis, river, c.75 mi (120 km) long, rising in W Nova Scotia, Canada, and flowing SW past Annapolis Royal to Annapolis Basin, an arm of the Bay of Fundy. The entrance to the basin, bordered by cli...

Gironde, estuary, France

(Encyclopedia)Gironde, estuary, c.45 mi (70 km) long and from 2 to 7 mi (3.2–11.3 km) wide, formed by the Garonne and Dordogne rivers, which join c.14 mi (23 km) N of Bordeaux. Sand banks and a high tidal range h...

Thames , river, United States

(Encyclopedia)Thames thāmz [key], river, c.15 mi (25 km) long, formed by the confluence of the Yantic and Shetucket rivers at Norwich, E Conn., and flowing south to Long Island Sound at New London. Primarily a tid...

Spuyten Duyvil Creek

(Encyclopedia)Spuyten Duyvil Creek spīˈtən dīˈvəl [key], tidal channel, now a ship canal, c.1 mi (1.6 km) long, SE N.Y., in New York City. It separates the northern tip of Manhattan island from the mainland a...

Piscataqua

(Encyclopedia)Piscataqua pĭskătˈəkwə, –kwā [key], navigable river, 12 mi (19 km) long, formed by the junction of the Cocheco and the Salmon Falls rivers, SE N.H., and flowing SE to Portsmouth harbor, formin...

sideband

(Encyclopedia)sideband, any frequency component of a modulated carrier wave other than the frequency of the carrier wave itself, i.e., any frequency added to the carrier as a result of modulation; sidebands carry t...

Phaeophyta

(Encyclopedia)Phaeophyta fēŏfˈətə [key], phylum (division) of the kingdom Protista consisting of those organisms commonly called brown algae. Many of the world's familiar seaweeds are members of Phaeophyta. Th...

Rio Grande, city, Brazil

(Encyclopedia)Rio Grande rēˈo͝o gränˈdĭ [key], city (1991 pop. 172,422), Rio Grande do Sul state, S Brazil, on the Rio Grande River at the outlet of the Lagoa dos Patos (a tidal lagoon) to the Atlantic Ocean....

Io, in astronomy

(Encyclopedia)Io īˈō [key], in astronomy, one of the 39 known moons, or natural satellites, of Jupiter. Io is subject to Jupiter's enormous tidal forces and is, as a result, the most volcanically active body in ...

Hell Gate

(Encyclopedia)Hell Gate, narrow channel of the East River, SE N.Y., between Wards Island and Astoria, Queens, New York City. Named Hellegat by the Dutch navigator Adriaen Block, who passed through it into Long Isla...