EARTH

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Across
  1. 2. math work
  2. 4. god of war
  3. 5. A school subject
  4. 6. god of war
  5. 9. friend of percy
Down
  1. 1. makes humans smart
  2. 2. the god of sea
  3. 3. a god of sky
  4. 7. A place to learn
  5. 8. the sea demigod