Greek Suffixes "-ology, -ologist" = studier of, expert in

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Across
  1. 3. STUDY of the environment
  2. 4. STUDIER of, or EXPERT of, life and living beings
  3. 7. STUDIER of, or EXPERT of, earth
  4. 9. STUDY of crafts and inventions
  5. 10. STUDY of animals
Down
  1. 1. STUDY of stars
  2. 2. STUDY of music
  3. 5. STUDIER of, or doctor of the elderly (old people)
  4. 6. STUDIER of, or doctor of hearing
  5. 8. STUDY of god or religion