KHIBG+4.2

toc =4.2 How Minerals Form=

Vocabulary

 * solution-** a combination in where one matter dissolves into another.
 * vein**- a slim channel/slab of a mineral that is very different from the rocks around it.

Outline

 * Processes that form minerals
 * minerals can form through two ways
 * crystallization of melted materials
 * crystallization of materials dissolved in water
 * Minerals from Magma
 * when magma stays under surface
 * cools down slowly
 * slow cooling means big crystals
 * Magma closer to the surface forms smaller crystals
 * has less time to cool- less time to form crystals
 * Minerals from hot water solutions
 * hot water solution cools, elements/ compounds leave solution
 * underground, hot water solutions and metals often follow cracks in a rock
 * the metals crystallize into veins that look like streaks of chocolate and vanilla ice cream
 * Minerals formed by evaporation
 * thick deposits of halite formed over millions of years
 * ancient seas evaporated slowly
 * Where minerals are found
 * earth's crust is made up of common rock- forming minerals
 * also combined in different types of rocks
 * most valuable minerals are in/near eareas with volcanic activity or mountain building
 * example : gold deposidtes were found along Sierra Nevada mountains