Sci Final 2

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Across
  1. 4. to use something again
  2. 5. to use less of something
  3. 6. where something comes from
  4. 8. all of the different living things in a habitat
  5. 13. a resource that can be replaced easily
  6. 15. land with steep sides and a flat top; it is higher than the land around it
  7. 18. when different people, plants or animals all try to get the same thing
  8. 20. a pipe or ditch that carries water to where it is needed
  9. 22. very fast
  10. 23. soil that is made up of the smallest grains called clay
  11. 25. when there are not a lot of one kind of plant or animal alive on Earth
  12. 27. to cause pollution
  13. 28. the layer below the crust made of part solid rock and part almost melted rock
  14. 29. the top layer of soil
  15. 31. a wall that is built to stop water in a river from moving
  16. 32. the energy and sound that is made when something explodes
  17. 34. a long pointed tooth that comes out of the mouth of some animals, like elephants
  18. 36. when a large group of animals moves to a new area
  19. 37. something that can harm air, land, soil or water
  20. 38. a building where water is cleaned so it can be used again
Down
  1. 1. to put something back where it was before
  2. 2. when 100% of one kind of living thing have all died
  3. 3. to stop something from happening
  4. 5. something from Earth that living things use
  5. 7. when different things look similar
  6. 9. a solid, nonliving part of earth that rocks are made up of
  7. 10. melted rock that flows onto land
  8. 11. anything that is not built or put there by humans
  9. 12. to use old materials to make new things
  10. 14. what different things are made up with
  11. 16. the layer below the subsoil made of rock
  12. 17. a huge piece of ice that moves slowly across the land
  13. 19. not a lot
  14. 21. the very long nose of an elephant
  15. 23. Earth’s thinnest, coolest and outside layer mantle
  16. 24. a kind of lake that is made behind a dam
  17. 26. something that happens quickly and can harm or destroy large areas
  18. 30. the rapid movement of rocks or soil down a hill
  19. 33. the number of one kind of living thing in a habitat
  20. 35. a deep hole used to get water from underground