Year 8 Science

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Across
  1. 4. Breaking down a molecule using heat
  2. 5. The second layer of the earth's structure, it is mostly solid
  3. 6. Molten Rock above the surface of the earth
  4. 12. 'Plates' that are thicker than the earth's crust
  5. 15. Rocks formed by layering of material under water
  6. 17. What is mixed together at the start of a chemical change
  7. 18. A reaction where a more reactive atom is added to a molecule
  8. 19. Always added to reactants in oxidation reactions
  9. 20. Molten Rock below the surface of the earth
  10. 21. Represented by Na in the periodic table
  11. 22. The third layer of the earth's structure, it is mostly liquid
  12. 24. A chemical change where atoms are rearranged
Down
  1. 1. Adding oxygen to a metal slowly over many years. Rust.
  2. 2. The law of the ... of mass
  3. 3. Adding oxygen to a molecule by setting it on fire
  4. 5. Something which cannot be created or destroyed in a chemical change
  5. 7. A reaction where oxygen atoms are added to a molecule
  6. 8. A chemical substance rocks are made out of
  7. 9. Represented by H in the periodic table
  8. 10. The top most layer of the earth's structure
  9. 11. What is made in a chemical change
  10. 13. The central layer of the earth's structure
  11. 14. Represented by C in the periodic table
  12. 16. Rocks formed from other rocks due to high heat and pressure
  13. 23. Rocks formed by the cooling of molten rock