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Sources of Deep Ocean-Basin Sediments, continued Chemical Deposits When substances that are dissolved in ocean water crystallize, these materials settle to the ocean floor as potato-shaped lumps of minerals called nodules. nodule a lump of minerals that is made of oxides of manganese, iron, copper, or nickel and that is found in scattered groups on the ocean floor Other minerals, such as phosphates, are also carried in the ocean floor before they crystallize and form mineral deposits on the ...
1) Chemically formed: Some minerals, halite, gypsum (selenite), dolomite, and calcite are soluble in water. All seawater contains at least some of these minerals in dissolved form.Sometimes a sea or part of a sea may become cut off from the rest of the world's oceans perhaps as a result of tectonic events.) Chemically formed: Some minerals, halite, gypsum (selenite), dolomite, and calcite are soluble in water. All seawater contains at least some of these minerals in dissolved form.