2.-They use heavy equipmet, like trucks to take topsoil to a special place where it will be saved until mining is finished in this area. Also drills and explosives are place in tho holes to break the overburden.
3.-Tunnels are used for traveling through the mine.
4.-Conveyor belts takes out coal from the mine.
5.-Three different types of underground mining are slope, drift and shaft. In a slope mine a tunnel slants down from the surface to the coal seam. In a drift mine is used when a coal seam lies inside a hill or a mountain. Anda shaft mine are from 125 to 1000 feet deep. Is a large hole or shaft that is drilled down into the ground until they reach the coal seam.
And five words from the glossary.
-Bituminuos: Type of coal used orimarily to generate electricity and mae coke for steel.
-Coke: A hard dry substance containing carbon that is produced by heating bituminous coal to a very hifgh temperature.
-Lignite: Type of coal with lowest carbon content, called "Brown Coal", used mainly for electric power generation.
-Conveyor: A continous moving belt that transprts large volumes of material.
-Longwall mining: Mechanised technique used to scratch coal from a block several feet wide.
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