Mikayla's Crossword!!!!!!!

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Across
  1. 1. Four children.
  2. 3. Someone who studies space.
  3. 6. Someone who studies the heart.
  4. 8. Building something.
  5. 9. The study of earth.
  6. 10. Two years.
Down
  1. 2. skin.
  2. 4. The study of life.
  3. 5. Someone who studies life.
  4. 7. A person that goes up to space.