Fun with 'logy'

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Across
  1. 2. The collection and study of shells
  2. 7. Study of prehistoric people and their cultures
  3. 9. Branch of medicine dealing with skin and its diseases
  4. 10. Study of earthquakes
  5. 12. Medical science dealing with X Rays
Down
  1. 1. Study of living organisms
  2. 2. Branch of medicine dealing with heart and its diseases
  3. 3. Medical science that deals with nervous system
  4. 4. beings
  5. 5. Study of fishes
  6. 6. Study of origins and social relationships of
  7. 8. Study of flags
  8. 11. Science of the history as recorded in rocks