Year 8 Crossword

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Across
  1. 3. Pattern of stars in the night sky
  2. 5. Path of one body around another in space
  3. 6. Dwarf planet once considered the ninth planet
  4. 7. Precious metal with symbol Au
  5. 10. Whip-like structure for cell movement
  6. 16. Force that attracts objects toward each other
  7. 17. Protein that speeds up chemical reactions in cells
  8. 20. Structure that carries genes
  9. 21. Gas that makes stars shine
  10. 23. Element with symbol Fe, found in blood
  11. 24. Planet often called Earth's twin
  12. 26. The control center of a cell
  13. 29. Bowl-shaped depression on a planet or moon
  14. 31. The first element on the periodic table
  15. 32. Element we breathe
  16. 33. Element with symbol K, found in bananas
  17. 34. Earth's natural satellite
  18. 35. Rocky object orbiting the Sun, smaller than a planet
  19. 38. The basis for all known life
  20. 39. The "Red Planet"
  21. 40. Complex organelle that packages proteins
  22. 42. Element important for strong bones
  23. 43. The boundary of a cell
  24. 44. Molecule that carries genetic information
  25. 45. The largest planet in our solar system
  26. 46. Icy body that develops a tail when near the Sun
  27. 47. Noble gas used to inflate balloons
Down
  1. 1. Plant cell structure where photosynthesis occurs
  2. 2. Reddish-brown metal used in electrical wires
  3. 4. Cellular structure where proteins are made
  4. 8. Element in chlorophyll, symbol Mg
  5. 9. The center of our solar system
  6. 11. Process plants use to make food from sunlight
  7. 12. Storage sac in plant cells
  8. 13. Jelly-like substance inside cells
  9. 14. Unit of heredity made of DNA
  10. 15. Radioactive element used in nuclear power
  11. 18. Element used to galvanize iron
  12. 19. Shiny element with symbol Ag
  13. 22. The powerhouse of the cell
  14. 25. Large collection of stars, gas, and dust
  15. 26. Noble gas used in glowing signs
  16. 27. Element in table salt, symbol Na
  17. 28. "Shooting star" seen in the night sky
  18. 30. Movement of water across a cell membrane
  19. 34. The smallest planet in our solar system
  20. 36. Planet known for its prominent rings
  21. 37. Light metal used in cans and foil
  22. 41. The windiest planet in our solar system