Dictionary; Spell Check; English Online; Grammar Rules; Spelling Book; Writing Center; Phrase of The Day; Synonyms; Online Proofreading; Essay Checker; Punctuation Checker; About Us; Company Overview; The Team; Press Releases; Careers; Blog; Help; Help Center; Contact Support; Tutorials; Stay in touch
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 ...
Large bodies of magma that solidify underground before they reach the surface of the crust are called plutons. Plutonic rocks form 7% of the Earth's current land surface. Coarse-grained intrusive igneous rocks that form at depth within the earth are called abyssal while those that form near the surface are called subvolcanic or hypabyssal. Intrusive structures are often classified according to whether or not they are parallel to the bedding planes or foliation of the country rock: if the intrusion is parallel the body is concordant, otherwise it is discordant.