GWBN+4.2

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=Vocabulary=


 * solution**- a mixture in which one substance dissolves in another


 * vein-** a narrow channel or slab of a mineral that is much different from the surrounding rock

=Outline=

=**T**= How Minerals Form= To go back to the top, click here
 * a volcanic pipe formed in the mantle at a depth of 120 kilometers or more and heat change carbon atoms into diamond
 * ===Processes that form mineral===
 * minerals can form through crystallization of melted material
 * minerals can form through crystallization of material dissolved in water
 * ===Minerals From Magma===
 * slow cooling leads to the formation of large crystals
 * fast cooling leads to small crystals
 * ===Minerals From Hot Water Solutions===
 * sometimes elements that form a mineral dissolve in hot water
 * when the hot water solution cools it crystallizes and becomes a mineral
 * pure metals that crystallize often form veins
 * a vein is a narrow channel or slab of mineral that is different from the surrounding rock
 * many minerals form where tectonic plates spread along the mid-ocean ridge
 * ocean water seeps through cracks in crust
 * then it touches the magma and it dissolves minerals from the crust and goes up
 * when it hits the sea it crystallizes and goes to the ocean floor
 * [[image:science_homework_-_42.JPG width="284" height="344"]]
 * ===Minerals Formed by Evaporation===
 * minerals can form when solutions evaporate
 * halite, gypsum, calcite crystals, minerals containing potassium form by evaporatiom
 * ===Where Minerals Are Found===
 * Earth's crust is made up of common rock forming minerals
 * rare and less common rocks are not distributed evenly throughout the crust
 * valuable minerals found in areas of volcanic activity and mountain building