MLEG4.3

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vocabulary
gemstone - a colorful mineral that has a glassy luster. ore **-** rock that contains a metal or economically useful mineral smelting **-** the process by which ore is melted to separate the useful metal from other elements alloy **-** a solid mixture of two or more metals

outline

 * The uses of minerals
 * Many materials come from minerals.
 * Gemstones
 * A mineral that is hard and has a glassy luster.
 * Metals
 * Metal is very useful because it can be stretched in shapes and be broken into useful pieces.
 * Other useful minerals
 * There are many other useful minerals other than gems and metals.
 * People may use those useful minerals in food, medicine, and etc.
 * Ores
 * Ores are rocks that contain a metal or is useful to humans.
 * Prospecting
 * A prospecter is anyone who searches for an ore deposite.
 * Mining
 * There are three types of mines.
 * Strip mines
 * Open pit mines
 * Shaft mines