Coal formation process and time
Coal is formed in this way? Some of the discussion whether it should be further studied and discussed. A large coal mine, coal seam is very thick, very good, but in general the area is not great. If it is millions of years plant leaves and roots of natural accumulation, it should be a great area because in ancient times the earth is everywhere on the forest and grassland, therefore, there should also be underground storage of coal seam traces; not very thick, because the plant leaves, rhizome rot into humus, and will be absorbed by the plants, so repeatedly, eventually being buried is not so concentrated, the boundaries of soil and coal will not divide as well.
The thickness of coal seam in a coal mine and the crust drop speed and accumulation amount of plant remains. The crust decreased rapidly, the plant remains piled thick, the coal seam is thick, on the other hand, the crust decline slowly, the accumulation of plant remains thin, the mine coal seam is thin. The tectonic movement of the crust to the original level of coal seam folds and faults occur, some underground coal seam buried deeper, and squeezed to the surface, even above the ground, more likely to be found. There are some relatively thin coal seam, and the area is not large, so there is no value related to the formation of coal mining, so far not find the update statement.
Coal is millions of years of plant leaves and roots, stacked on the ground with a layer of very thick black humus, due to changes in the earth's crust constantly buried underground, long isolated from the air and under high temperature and pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rocks, which is the coal forming process.
