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Solway Firth

(Encyclopedia)Solway Firth sŏlˈwā [key], arm of the Irish Sea, c.40 mi (60 km) long, separating NW England from SW Scotland. The waterway, which has a tidal bore, receives the Esk, Annan, Urr, Eden, and Derwent ...

Huygens, Christiaan

(Encyclopedia)Huygens, Christiaan krĭsˈtyän hoiˈgəns [key], 1629–95, Dutch mathematician and physicist; son of Constantijn Huygens. He improved telescopic lenses and discovered (1655) a satellite of Saturn a...

breakwater

(Encyclopedia)breakwater, offshore structure to protect a harbor from wave energy or deflect currents. When it also serves as a pier, it is called a quay; when covered by a roadway it is called a mole. In the Unite...

vibration

(Encyclopedia)vibration, in physics, commonly an oscillatory motion—a movement first in one direction and then back again in the opposite direction. It is exhibited, for example, by a swinging pendulum, by the pr...

Meghna

(Encyclopedia)Meghna mĕgˈnə [key], river, c.130 mi (210 km) long, formed at the outlet of the Surma valley, NE Bangladesh, by the branches of the Surma River. It flows south, receiving arms of the Ganges and Bra...

Trent , river, England

(Encyclopedia)Trent, river, c.170 mi (270 km) long, rising on Biddulph Moor, Staffordshire, W England. It flows generally NE through central England before joining with the Ouse River to form the Humber estuary. Th...

Patos, Lagoa dos

(Encyclopedia)Patos, Lagoa dos ləgôˈə do͝os päˈto͝os [key] [Port.,=lake of the ducks], shallow tidal lagoon, c.150 mi (240 km) long and up to 30 mi (48 km) wide, Rio Grande do Sul state, SE Brazil. A wide s...

virtual telescope

(Encyclopedia)virtual telescope, a computerized interferometer (see interference) that merges the images from two or more telescopes to obtain a single, large, enhanced image. The image in each telescope is made fr...

Alderney

(Encyclopedia)Alderney ōrēnyēˈ [key], anc. Riduna, island, c. 3 sq mi (7.7 sq km), in the English Channel, northernmost of the larger Channel Islands. It is separated from the Frenc...

Belle Isle, Strait of

(Encyclopedia)Belle Isle, Strait of bĕlīlˈ [key], c.35 mi (60 km) long and from 10 to 15 mi (16–24 km) wide, between the island of Newfoundland and Labrador-Ungava peninsula, Canada. The northern entrance to t...