My crossword

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Across
  1. 1. is like a asteroid but consisting of a nucleus with ice and dust
  2. 3. right above the mantle
  3. 4. what makes day turn into night
  4. 5. is something planets do in space
  5. 7. located on Jupiter
  6. 9. to give off gas or heat
  7. 10. something an asteroid makes when it hits the earth's surface
  8. 13. the forth planet from the sun
  9. 15. something that makes a crater in earth after it hits the ground
  10. 16. a planet that we live or a planet with life
  11. 18. the first of all the planets that is the hottest
Down
  1. 2. its between the crust and the outercore
  2. 4. something that rains down from space like an asteroid
  3. 6. the liquid part of earth
  4. 8. something in space that floats around the sun
  5. 11. an invisible line going through earth
  6. 12. where all the planets are located
  7. 14. sixth planet from the sun
  8. 17. something that goes around the planets
  9. 19. a big star that is made from mostly hydrogen