phys- and geo-

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Across
  1. 2. A person who studies geography
  2. 5. A medical doctor
  3. 6. The science of matter, motion, force, and energy
Down
  1. 1. Heat that comes from inside the earth
  2. 3. Study of the Earth’s surface and human activity
  3. 4. Study of how the body functions
  4. 6. Relating to the body