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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. ... which predate land plants—this coal is presumed to have originated from residues of algae.


Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay ... In the context of underground coal mining, shale was frequently referred to as slate well into the 20th century. ... The enriched values are of controversial origin, having been alternatively attributed to input from hydrothermal ...


front 15. Which one of the following is an igneous rock? back 15. rhyolite. front 16 . Coal beds originate in ______. back 16. freshwater coastal swamps and bogs ...


Coal begins as dead plant material (trees, ferns, leaves-- typically) which fall into oxygen depleted waters in low energy swamp or swamp-like setting.


Coal is a sedimentary rock of biochemical origin. ... The key to large productive coal beds or seams seems to be long periods of time of organic accumulation ...


A) clastic texture C) chemical origin B) good stratification D) high porosity 18) In ..... anthracite 93) Coal beds originate in what type of depositional environment?


... as a possible reservoir rock for oil or gas? A. High porosity. B. Classic texture. C. Chemical origin. D. Good stratification. 2. Coal beds originate in ______.


Chemical Organic Sedimentary Rocks : Coal (30), Chert (31): Flint, Jasper and Agate (32). ▫ ..... coal beds originated in swampy, saturated, environments. ▫.


Introduction. Mineral matter in coal can originate as (1) inorganic elements from plants ... Freeport coal bed is dominantly authigenic, on the basis of statistical.