About: Marine sediment

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Sediment from marine waters

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  • material depositado de forma natural en una cuenca sedimentaria marina (es)
  • matériau déposé en milieu marin (fr)
  • sediment (ca)
  • sediment from marine waters (en)
  • sedimento proveniente da acque marine (it)
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  • left (en)
  • right (en)
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  • dbr:Radiolaria
  • Centric diatom (en)
  • ...and defensive spines (en)
  • ...can have more than one nucleus (en)
  • ...extinct fossil (en)
  • ...have plates called coccoliths (en)
  • Burning hydrate (en)
  • Gas hydrate from (en)
  • Manganese nodules on the seabed (en)
  • Oolites from a beach (en)
  • Southern-ocean sediment (en)
  • Harvesting salt left behind from the evaporation of seawater, Thailand (en)
  • a subduction zone (en)
  • in the Bahamas (en)
  • Magma rising from a chamber below the mid-ocean ridge forms new ocean crust that spreads away from the ridge (en)
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  • center (en)
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  • horizontal (en)
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  • Foraminiferans are unicellular zooplankton [[#Marine protists (en)
  • Coccolithophores build calcite skeletons important to the marine carbon cycle (en)
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  • center (en)
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  • Foraminiferans (en)
  • Coccolithophores (en)
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  • center (en)
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  • 9 (xsd:integer)
  • Salt Farmers - Pak Thale-edit1.jpg (en)
  • Foram-globigerina hg.jpg (en)
  • G bulloides Brady 1884.jpg (en)
  • Centric diatom .jpg (en)
  • Discoaster surculus 01.jpg (en)
  • Burning hydrate inlay US Office Naval Research.jpg (en)
  • Gashydrat mit Struktur.jpg (en)
  • Konkrecje na dnie oceanu.JPG (en)
  • Mid-ocean ridge topography.gif (en)
  • Ooids, Joulter Cays, Bahamas.jpg (en)
  • Radiolarian - Podocyrtis ampla .jpg (en)
  • Southern-ocean sediment hg.png (en)
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  • 2.209032E16 (dbd:second)
  • Biogenous sediments can allow the reconstruction of past climate history from oxygen isotope ratios. Oxygen atoms exist in three forms, or isotopes, in ocean water: O16, O17 and O18 . O16 is the most common form, followed by O18 . O16 is lighter than O18, so it evaporates more easily, leading to water vapor that has a higher proportion of O16. During periods of cooler climate, water vapor condenses into rain and snow, which forms glacial ice that has a high proportion of O16. The remaining seawater therefore has a relatively higher proportion of O18. Marine organisms which incorporate dissolved oxygen into their shells as calcium carbonate will have shells with a higher proportion of O18 isotope. This means the ratio of O16:O18 in shells is low during periods of colder climate. When climate warms, glacial ice melts releasing O16 from the ice and returning it to the oceans, increasing the O16:O18 ratio in the water. When organisms incorporate oxygen into their shells, the shells will contain a higher O16:O18 ratio. Scientists can therefore examine biogenous sediments, calculate the O16:O18 ratios for samples of known ages, and from those ratios, infer the climate conditions under which those shells were formed. The same types of measurements can also be taken from ice cores; a decrease of 1 ppm O18 between ice samples represents a decrease in temperature of 1.5°C. (en)
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  • Reconstructing past climate (en)
  • The supercontinents (en)
  • through sediment analysis (en)
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  • Marine sediment (en)
  • Sedimento marino (es)
  • Sédimentation marine (fr)
  • Marines Sediment (de)
  • Sedimen laut (in)
  • 海底堆積物 (ja)
  • Osady morskie (pl)
  • Sedimento marinho (pt)
  • Морские отложения (ru)
  • Морські відклади (uk)
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