Yahya Puzzle

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Across
  1. 3. 8th planet closest to the sun
  2. 5. The breaking down of rock
  3. 8. the wavelength of the light is stretched, so the light is seen as 'shifted' towards the blue part of the spectrum
  4. 12. 7th planet closest to the sun
  5. 13. 5th planet closest to the sun
  6. 14. The solid, hottest part of the Earth, also primarily made of iron and nickel.
  7. 17. 4th planet closest to the sun
  8. 18. The star of our Solar System
  9. 20. The largest layer of the Earth, a semi-solid material that is much hotter than the crust.
Down
  1. 1. A theory that describes how the universe expanded from an initial state of high density and temperature
  2. 2. The wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum
  3. 4. The dropping off of rock, usually forming new land
  4. 6. The rigid outer layer of the Earth, including the crust and the upper part of the mantle.
  5. 7. 2nd planet closest to the sun
  6. 9. The thin outer layer of the Earth where we live, composed of solid rock.
  7. 10. A liquid layer of iron and nickel that generates the Earth's magnetic field.
  8. 11. 6th planet closest to the sun
  9. 15. 3rd planet closest to the sun
  10. 16. The movement of rock
  11. 19. 1st planet closest to the sun