CSTC+4.3

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Vocabulary

 * Gemstone**: a mineral that is hard and colorful and has an extraordinary shiny luster


 * Ore**: a type of rock that has a metal or a mineral that is economically useful


 * Smelting**: the development which ore is liquefied to split the useful metal from other elements


 * Alloy**: a hard-core solid mixture of two or more metals


 * Strip Mining**: Earthmoving equipment scrapes away the soil to expose ore


 * Open Pit Mining**: miners use giant earthmoving equipment to dig a tremendous pit


 * Shaft Mines**: often has a network of tunnels that extend deep into the ground, following the veins of ore

Outline

 * The uses of minerals**
 * gemstones are rare and beautiful
 * metals to build monuments
 * other uses
 * food
 * medicines
 * fertilizers
 * building materials


 * Ores**
 * rock that contains useful minerals


 * Prospecting**
 * prospector