fossil fuel

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Across
  1. 3. anthracitealso known as hard coal and black coal,is a hard compact variety of coal that has a submetallic luster
  2. 5. is o patral, occurring petroleum product Composed of hdrocarton depsits and other organic materials.
  3. 6. coal is alower grade of coal that contains 35-45% carobn. The properties of are betweeh those of lighite, lowest grade of coal,and those of bituminous coal
  4. 8. also called fossil gas somet imes just gos is a maturall occurring hydrocarbon gas mixture commonly includes various amounts of other higher alkanes.
  5. 11. lignite,oftenrefered to as brown coal, is a soft,trown, combustible,sedimentary rock formed from naturally compressed peat.
  6. 12. afossilfuelisa hydrocarbon-containg material formed underground from the remains of dead plants and animals that humans extract and burm to release energy for use.
Down
  1. 1. the minevaluels such as coal,petroleum, and natural gas are described as a special type of economic depsit.
  2. 2. is a liquid which occurs naturally in rock formations
  3. 4. is o raturally occurring petroleum product composed of narocardoh deposits and other organic materials.
  4. 7. coal,or black cod, is a type of coal containing a tar-like substance called bitumen or asphalt
  5. 9. is combustible black or brownish sedimentary rock, formed as rtrato coall seams.
  6. 10. is the surface organit layer of a soil that consists of partially decomposed organic matter, derved mostly form plant materially.