chapter 18 and 19

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Across
  1. 2. an instrument used by early sailors
  2. 4. the study of the universe
  3. 6. the milky way is an example
  4. 7. our atmosphere makes the stars look like they are doing this
  5. 8. they study fossils
  6. 11. an object used to observe the universe
  7. 12. space telescope
  8. 17. a group of stars
  9. 19. evidence of life in the past
  10. 21. the scale of hardness
  11. 22. the milky way is this type of galaxy
  12. 23. stars are mostly made up of this
  13. 25. rocks are made up of these
  14. 27. the brightest star
  15. 28. the texture of the mark the mineral leaves behins
Down
  1. 1. molten rock which flows from the mantle
  2. 2. an object which orbits another
  3. 3. clouds of glowing gas
  4. 5. sedimentary rocks are formed from this
  5. 8. the closest star to our solar system
  6. 9. describes how well light travels through it
  7. 10. the measurement that our universe is measured with
  8. 13. the process of breaking down rocks
  9. 14. the process of rocks moving from one place to another
  10. 15. the rocks which are formed from volcanic eruptions
  11. 16. the process of change in rocks
  12. 18. 12 very well known constellations
  13. 20. how a mineral reflects light
  14. 24. the appearance of the snap of the material
  15. 26. magma which flows onto the earths surface