A "'water column "'is a conceptual column of water from the surface of a sea, river or lake to the bottom sediments.
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Since the late 19th century, dredging of river bottom sediments has been done to allow large ships to enter the Fox River.
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The heavier bottom sediment layer is removed by a chain and flight scraper ( or similar device ) and a sludge pump.
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It is a small ( up to 5 mm ) species which burrows in bottom sediments, between 10 and 80 metres deep.
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One thought is that this trilobite may have lain in wait for prey buried in the bottom sediment with only its periscope eyestalks protruding.
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A tiny copepod crustacean, " Leptocaris stromatolicolus ", is known only from the interstices of these stromatolites and bottom sediments in the saline pools.
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Hexasterophorans have skeletons composed of overlapping six-rayed substratum; less often rooted by the anchoring spicules and rarely inserted directly into the loose bottom sediments.
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When the cyanobacteria die and sink to the bottom they consume oxygen leading to further hypoxia and more phosphorus is released from bottom sediments.
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In the environment endrin exists as either endrin aldehyde or endrin ketone and can be found mainly in bottom sediments of bodies of water.
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The material that was thrown into the air by the steam, mainly old lake bottom sediments, was deposited around the new vent in little mounds.
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