'Geo'

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Across
  1. 2. The study of places, people and the environment
  2. 4. The study of the physics of the Earth and its environment in space
  3. 5. A branch of mathematics
  4. 6. The study of the effects of Earth's geography on politics and international relations
  5. 7. A branch of science relating to the Earths magnetic field
Down
  1. 1. Scientists who study the Earth
  2. 3. A hollow, spherical rock
  3. 4. To study the Earth
  4. 5. Heat energy from the Earth
  5. 6. A branch of science involving chemical change