General Knowledge

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Across
  1. 2. Cannot be scratched by anything other than itself
  2. 3. The largest rainforest
  3. 4. Force that pulls us towards Earth
  4. 7. Famous scientist, known for E=MC2
  5. 9. Large triangular structures built by the Egyptians
  6. 10. The largest planet in our solar system
Down
  1. 1. Process plants use to make food
  2. 5. The gas we need to survive
  3. 6. Major sporting event held every four years
  4. 8. Special object that attracts metal or steel