exaerobic
exaerobic Applied to a laminated biofacies formed in a depositional environment that was anaerobic, or almost so, and that contains epibenthic (see EPIBENTHOS) fossils of macroinvertebrates (e.g. Brachiopoda, Bivalvia, Mollusca).
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Psilophytales
Psilophytales (psilophytes) Primitive pteridophytes, which were the earliest vascular plants, from the Silurian an… Hygroscopic Nucleus , hygroscopic nucleus Microscopic particle (e.g. of sulphur dioxide, salt, dust, or smoke) in the free air, on which water vapour may condense to form… Vertisols , Vertisols Mineral soils, an order of soils that contain more than 30 per cent by weight swelling clay (e.g. montmorillonite), and that expand when we… Alum , alum (ăl´əm), any one of a series of isomorphous double salts that are hydrated sulfates of a univalent cation (e.g., potassium, sodium, ammonium, ce… Hepatomegaly , hepatomegaly Enlargement of the liver as a result of congestion (e.g. in heart failure), inflammation or fatty infiltration (as in kwashiorkor).
hepa… Silicate , silicate
silicates The most important and abundant group of rock-forming minerals, which can be classified according to the structural arrangement of…
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exaerobic