The Master's Sacred Puzzle

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Across
  1. 3. I am the centre of a three-dimensional shape
  2. 5. I am a type of maths
  3. 8. I am used for looking into space
  4. 10. I am the outline of a shape
  5. 12. I detect heat
  6. 13. I try to predict the future
  7. 15. I am the most similar and the same meaning to geography
  8. 16. 10 of me make a centimetre
  9. 17. People know me to study animals and wildlife
  10. 18. I am the study for the national geographic channel
Down
  1. 1. I am usually used underwater to detect pressure
  2. 2. I am a bottle that keeps my contents warm
  3. 4. I am 1000 metres
  4. 6. you usually see me at the front seat of a car
  5. 7. I am very important for microsurgery
  6. 9. I am a crystal with cavities
  7. 11. I am a belief but not real
  8. 14. I am a root in different word form