fossil fuel

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Across
  1. 4. oil
  2. 6. coal,or black cod, is a type of coal containing a tar-like substance called bitumen or asphalt
  3. 8. gaus ( also called fossil gas somet imes just gos is a maturall occurring hydrocarbon gas mixture commonly includes various amounts of other higher alkanes.
  4. 10. mineval fuels such as coal,petroleum, and natural gas are described as a special type of economic depsit.
  5. 12. is the surface organit layer of a soil that consists of partially decomposed organic matter, derved mostly form plant materially.
  6. 13. is a liquid which occurs naturally in rock formations
  7. 15. gas
  8. 16. is combustible black or brownish sedimentary rock, formed as rtrato coall seams.
Down
  1. 1. 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
  2. 2. oil
  3. 3. also known as hard coal and black coal,is a hard compact variety of coal that has a submetallic luster
  4. 5. refered to as brown coal, is a soft,trown, combustible, sedimentary rock formed from naturally compressed peat.
  5. 7. oil is o patral, occurring petroleum product Composed of hdrocarton depsits and other organic materials.
  6. 9. fuel
  7. 11. fuel
  8. 14. oil is o raturally occurring petroleum product composed of narocardoh deposits and other organic materials.