You asked: What is meant by coal seam?

What is a coal seam made of?

The underlying erosion surface is considered the top of the Conemaugh Group, formerly known as the Lower barren measures because this formation contains few coal seams. The Monongahela is composed mainly of sandstone, limestone, dolomite, and coal, and consists of a series of up to ten cyclothems.

Why does coal occur in seams?

Under the right conditions, peat transforms into coal through a process called carbonization. Carbonization takes place under incredible heat and pressure. About 3 meters (10 feet) of layered vegetation eventually compresses into a third of a meter (1 foot) of coal! … Coal seams exist on every continent.

What is the thickest coal seam?

The thickest known coal seam in the world Is the Wyoming, near Twin Creek, in the Green river coal basin, Wyoming. It Is eighty feet thick, and upward of 300 feet of solid coal underlie 4000 acres.

Why do coal seam fires last for so long?

“Unlike timber, coal when it gets hot has massive thermal mass which is very hard to extinguish. … Coal, and particularly brown coal, is very reactive to oxygen, and will generate CO2 and that creates heat. As the coal gets hotter it will eventually get to flame temperature and that coal will burn.”

THIS IS INTERESTING:  What is the main problem with using coal to generate electricity?

How are coal seams named?

The coal seams can generally be identified by their position relative to the marine bands as mentioned.

Where is coal found in the earth’s layers?

Coal deposits are found in sedimentary rock basins, where they appear as successive layers, or seams, sandwiched between strata of sandstone and shale.

Is coal still being formed?

Coal is very old. The formation of coal spans the geologic ages and is still being formed today, just very slowly. Below, a coal slab shows the footprints of a dinosaur (the footprints where made during the peat stage but were preserved during the coalification process).

What is the formula of coal?

The chemical formula of coal is reported as: C135H96O9NS. Coal is usually taken as 85% carbon based on dry mass.

What is coal an example of *?

Coal is an example of Sedimentary rocks. Coal is a biochemical sedimentary rock because coal is formed from organic matter or sediment that comes from biological processes. Coal is typically found near swampy areas, or areas where sediment has little contact with oxygen.