- Stock Photography: COAL MINERAL RAW ORE ON WHITE BACKGROUND. by Mohaeljawphoto
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- Photo title: Coal mineral raw ore on white background.
- Author: Mohaeljawphoto
- Cover photo description:
- Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon, along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is a fossil fuel that forms when dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal, and lastly anthracite. This involves biological and geological processes. The geological processes take place over millions of years.
- Image ID:110824048
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