Orange and Green

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Across
  1. 3. A set of rules that explain how words work.
  2. 6. sometimes - not very often
  3. 7. how tall something is
  4. 9. simply
  5. 10. protect
Down
  1. 1. full of energy
  2. 2. the past
  3. 4. Scientists work in this way.
  4. 5. keeps us alive
  5. 8. The past tense of hear.
  6. 10. a collection