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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.


Although coal, by definition, may be composed of nearly 50% mineral matter, most commercial-grade coal in the United States is mined from coal beds that ...


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?


Selected Answer: Foliation Correct Answer: Foliation Question 2 1 out of 1 points Coal beds originate in ______. Selected Answer: freshwater coastal swamps ...


How does coal form? deck-page-img. What are three types of sedimentary ... Coal beds originate in ______. deck-page-img. Which texture best describes a ...


Coal beds originate in… deck-page-img. Which of the following sedimentary features can each be used to determine paleocurrent directions? deck-page-img.


urged with great energy. This, the doctrine of allochthonous origin, conceives that coal beds are composed of transported vegetable matter deposited in the sea ...