The most common method of extracting coal from mines are:
- The most common method of surface mining is open pit mining. This technique is most appropriate for areas with flat terrain, exposing coal while removing soil above the coal layer in batch system. When all the soil above the coal layer is removed, the underlying coal block is exposed and can then be drilled and blown. This process is performed successively, block by block.
- The contour mining method is the most commonly used surface mining technique in steep terrain areas. This method involves removing the soil above the charcoal layer in a standardized way, following the surroundings of a hill or a mountain, for example. This method requires great safety precautions, as it can cause large landslides and serious soil erosion problems. To solve these problems, a variety of methods have been developed over the years to establish limits for mining work.
- The method of mountain mine clearance involves the removal of mountains to expose coal shafts, eliminating sterile areas from mining sites. This practice combines the technology of mining of surroundings with the one of mining in the open sky.
1) Plains are formed when everything in the land weathered or eroded away,leaving the land flat.
and
2) Another way is when volcano erupt ,and burn everything in its way,all that is left are the plains,This makes bare land or barren plains.
The most common are from dried up lakes or a glacier moving past an area.
Answer:
All meteorites come from inside our solar system, most of them are fragments that broke apart long ago in the asteroid belt, such fragments orbit the sun before colliding the earth.
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This would would have to be sea food, specifically fish.