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Definitions (460)
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geyseran eruption of hot water and steam from a hydrothermal system. It is usually of cyclic occurrence, and ejects only small amounts of solid material. The ejection mechanism is volume change due to boiling, as opposed to ejection of water because of artesian pressure alone.
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atmospherethe envelope of gases surrounding the Earth
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biological productivitythe production of nutrients in the ocean
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micaa variably-coloured group of layered, sheet-like silicate minerals that include muscovite and biotite
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paleoclimateancient climate as determined from the geological record [paleoclimatic]
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a∙b∙c∙d∙e∙f∙g∙h∙i∙j∙k∙l∙m∙n∙o∙p∙q∙r∙s∙t∙u∙v∙w∙x∙y∙zA accelerator mass spectrometry: commonly known as AMS; a method for measuring 14C, 10Be and other isotopes including those produced by cosmic rays [accelerator mass spectrometer]
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accretionthe process of [1] adding sediment to a river, beach or offshore area; [2] adding terranes to a landmass; [3] forming planets
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acidicrelating to fluids with pH less than 7 [acid]
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acousticsthe study and measurement of sound waves
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active volcanoa volcano that is currently erupting, or has erupted within the past few thousand years and may do so again in the future
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