science

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Across
  1. 5. the solid layer of rock beneath soil
  2. 6. animal with no back bone
  3. 9. time divided in areas
  4. 12. the grinding away of rock by other rock
  5. 13. the preserved remains or traces of living things
  6. 16. the energy in an object
  7. 19. imaginary line through the middle of the earth
  8. 20. wide valley were a river flows
  9. 21. the force that opposes the motion
Down
  1. 1. one time in the past when continental glaciers covered large parts of the earth
  2. 2. a large mass of moving ice and snow on land
  3. 3. land form made of sediment deposited by a river
  4. 4. a land form with high elevation
  5. 7. donald trump
  6. 8. dark colored organic material in soil
  7. 10. wind erosion that removes surface materials
  8. 11. the energy to do work
  9. 14. lake a meander cut of from a river
  10. 15. soil organism that breaks down the remains of an organism
  11. 17. when a type of organism no longer exists any where on earth
  12. 18. a large change in soil formed by erosion