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Answer :
Final answer:
The two extraction methods commonly used for coal are subsurface mining and mountaintop removal. Subsurface mining accesses deep coal seams, while mountaintop removal blasts off mountain tops to expose coal. Other methods like vertical drilling and hydraulic fracturing are used for oil and gas, not coal.
Explanation:
Extraction Methods for Coal
Coal is extracted from the earth using various methods, and two of the most commonly employed techniques are:
- Subsurface Mining: This method involves digging tunnels or shafts into the earth to access coal seams that are located deep underground. Miners use various tools and machinery to remove the coal safely, minimizing surface disruption.
- Mountaintop Removal: This technique involves blasting off the tops of mountains to expose the coal seams beneath. The extracted coal is then transported away, and the displaced earth is often pushed into adjacent valleys, which can have significant environmental impacts.
Methods like vertical drilling and hydraulic fracturing are more commonly associated with the extraction of oil and natural gas, not coal.
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