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chain dredge

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  • Dredge-up — refers to a period in the evolution of a star where a surface convection zone extends down to the layers where material has undergone nuclear fusion. As a result, the fusion products are mixed into the outer layers of the stellar atmosphere and… …   Wikipedia

  • dredge — dredge1 /drej/, n., v., dredged, dredging. n. 1. Also called dredging machine. any of various powerful machines for dredging up or removing earth, as from the bottom of a river, by means of a scoop, a series of buckets, a suction pipe, or the… …   Universalium

  • dredge — I. verb (dredged; dredging) Date: 1508 transitive verb 1. a. to dig, gather, or pull out with or as if with a dredge often used with up b. to deepen (as a waterway) with a dredging machine 2. to bring to light by deep searching often used with up …   New Collegiate Dictionary

  • Scallop dredge — The scallop dredge, or oyster dredge, is a dredge which is towed along the bottom of the sea by a fishing boat until it is full of scallops or oysters. It is then lifted onto the boat and emptied. The dredge can also be used to harvest sea… …   Wikipedia

  • dipper dredge — noun also dipper shovel : a floating dredging machine with a single machine operated bucket working on an arm * * * dipper dredge, a floating dredge that has a large scoop shovel or dipper that hangs on a chain from a derrick. Both the dipper and …   Useful english dictionary

  • Dredging — Dredge redirects here. For other uses, see Dredge (disambiguation). Dredgers redirects here. For the German municipality, see Dreggers. Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow… …   Wikipedia

  • mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… …   Universalium

  • Deepwater Horizon oil spill — 2010 oil spill and BP oil spill redirect here. For other oil spills in 2010, see 2010 oil spill (disambiguation). For the 2006 oil spill involving BP, see Prudhoe Bay oil spill. For the drilling rig and explosion, see Deepwater Horizon… …   Wikipedia

  • harbours and sea works — Introduction harbour also spelled  harbor        any part of a body of water and the manmade structures surrounding it that sufficiently shelters a vessel from wind, waves, and currents, enabling safe anchorage or the discharge and loading of… …   Universalium

  • Adam's Bridge — (Tamil: ta. ஆதாம் பாலம் transl|ta|āthām pālam ), also known as Rama s Bridge or Ram Setu (Tamil: ta. இராமர் பாலம் transl|ta|irāmar pālam , Sanskrit: sa. रामसेतु IAST|rāmasetu ) [also spelled Rama Setu , Ram Sethu , Ramasethu and variants.] , is a …   Wikipedia

  • commercial fishing — Introduction  the taking of fish and other seafood and resources from oceans, rivers, and lakes for the purpose of marketing them.       Fishing is one of the oldest employments of humankind. Ancient heaps of discarded mollusk shells (shell… …   Universalium

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