spell

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Across
  1. 4. A measurable side of something
  2. 8. Two sets of two equal sides
  3. 9. Earth measurement
  4. 10. Put one on top of the other
Down
  1. 1. Aquatic larvae, then air-breathing adults
  2. 2. A one-celled microorganism
  3. 3. A small bird
  4. 5. A fraction with a larger numerator than denominator
  5. 6. Islands in the South Pacific Ocean
  6. 7. Divide down to the lowest form