A Dictionary of Earth Sciences by Stella A. Stiegeler BSc (eds.)

By Stella A. Stiegeler BSc (eds.)

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A current that flows close to the sea floor or within the lowermost layers of water in deep-sea areas. The term has also been used to describe the currents over shelf areas 36 that arise owing to density-driven flow, tidal flow, or wave-induced flow. In the case of deep-water bottom currents, flow velocities have been calculated theoretically, others have been measured using current meters or special floats. Bottom flow in part of the Antarctic bottom current can attain 3 em/sec but is usually much less.

This phenomenon, for which no clear explanation has yet been Cambrian discovered, is characteristically seen in the iron-rich Jurassic sands of Northamptonshire. Cambrian. The earliest period of *Phanerozoic time and of the *Palaeozoic Era. Rocks laid down during this period are. the first to show an abundance of fossils, which consist of primitive representatives of most of the invertebrate animal phyla known today. The Cambrian began about 590 million yers ago, following the *Precambrian, and was succeeded after a period of some 75 million years by the *Ordovician.

Serious damage may even be caused to timber and concrete structures, for example groynes. bornhardt. See inselberg. bornite. A red-brown copper mineral, CusFeS4, found in basic igneous rocks and vein deposits. borolonite. See syenite. boss. A roughly circular igneous intrusion that has a diameter of less than 25 km. Compare stock. botryoidal. Denoting a mineral consisting of spheroidal aggregates resembling a bunch of grapes. Compare reniform. bottom current. A current that flows close to the sea floor or within the lowermost layers of water in deep-sea areas.

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