general knowledge

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Across
  1. 6. popular citrus fruit
  2. 7. The outer layer of the Earth
  3. 9. The study of numbers and shapes (Answer: Mathematics)
Down
  1. 1. The capital of England
  2. 2. A flying insect that produces honey
  3. 3. A unit of time equal to 60 seconds
  4. 4. Home of the Eiffel Tower
  5. 5. The opposite of cold
  6. 8. The opposite of old
  7. 10. Chemical symbol for gold