7th Grade Science Review

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Across
  1. 4. cycle of matter that includes bacteria, lightning, and dead organisms
  2. 5. mass cannot be created nor destroyed
  3. 7. the puzzle pieces of the lithosphere
  4. 10. layer of Earth that includes the crust and the top of the mantle
  5. 14. one possible path that energy can travel in an ecosystem
  6. 16. energy that is stored
  7. 17. found on the Periodic Table
  8. 21. two or more elements bonded together chemically
  9. 22. thinnest layer of the earth
  10. 23. two or more elements or compounds NOT chemically combined
  11. 26. layer of earth that is liquid
  12. 27. smallest part of matter
  13. 30. chemical change that releases energy in form of heat
  14. 32. boundary where plates divide
  15. 33. neutral particles in the nucleus of an atom
  16. 35. positive particles in the nucleus of an atom
  17. 36. the new molecules formed after a chemical reaction
  18. 38. change that does not change the identity of a substance
  19. 39. “What is the effect of - on -?”
  20. 43. theory presented by Alfred Wegener
  21. 44. rock made from melting and cooling
  22. 49. invisible force around a magnet
  23. 50. number one factor affecting population size
  24. 52. if then because
  25. 53. process that moves small rock pieces
  26. 54. boundary where plates move together
Down
  1. 1. variable you measure or observe during/after an experiment
  2. 2. finding the age of a rock layer or fossil compared to others
  3. 3. the ingredients in a chemical reaction
  4. 6. negative particles that travel around the nucleus of an atom
  5. 8. change that rearranges the atoms in molecules
  6. 9. boundary where plates slide side by side
  7. 11. name of the super continent
  8. 12. variable that you change or test in an experiment
  9. 13. thickest layer of earth
  10. 15. process in which magma rises and cools at divergent oceanic plates
  11. 18. chemical change that needs energy to occur
  12. 19. process at convergent boundaries where dense crust goes under and melts into magma
  13. 20. igneous rocks formed above ground
  14. 24. potential energy __ as kinetic decreases
  15. 25. hydrogen silver erbium
  16. 28. polonium titanium
  17. 29. anything from Earth which humans use
  18. 31. always points north, unless near a magnet
  19. 34. energy of movement
  20. 37. number of organisms of one species that can live in an ecosystem
  21. 40. rock made from compaction and cementation
  22. 41. heat transfer in fluids; hot fluids rise and cool fluids sink
  23. 42. rock made from heat and pressure
  24. 45. all of the possible paths that energy can travel in an ecosystem
  25. 46. cycle of matter that includes respiration, photosynthesis, and pollution
  26. 47. process that breaks rock into smaller pieces
  27. 48. product made from natural resources using chemical changes
  28. 51. igneous rocks formed underground