Soil, Fossils and Energy 6.2/6.3

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Across
  1. 4. C horizon
  2. 6. a unit of time
  3. 8. a mixture of bits of rock and once living plants and animals
  4. 10. ususally found with oil
  5. 11. the exact age of a rock/fossil
  6. 13. "water"
  7. 16. harmful materials added to soil, air, or water
  8. 19. where most plant roots grow
  9. 20. an energy source that can cause radioactive pollution if we aren't careful
  10. 22. a resource that is used faster than it's made
  11. 23. each layer of soil
  12. 24. B horizon
  13. 26. doesn't create as much heat as fossil fuels when burned
  14. 27. a law that states that each layer is older than the layer above it.
  15. 28. the part of soil made up of decayed organic material
Down
  1. 1. a resource that can be replaced faster than its used
  2. 2. the age of one rock/fossil compared to another
  3. 3. coming from living things
  4. 5. the preservation of natural resources
  5. 7. a material that formed from ancient organisms that is used today as a source of energy
  6. 9. where oil and natural gas formed
  7. 11. an energy source other than a fossil fuel
  8. 12. hardend peat
  9. 14. planting rows of grasses between rows of other crops
  10. 15. planting different crops to replace nutrients in the soil
  11. 17. the main energy source of Iceland
  12. 18. when fossil fuels formed
  13. 21. the remains or traces of ancient life
  14. 25. where coal formed