Chelsea's scientific crossword

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Across
  1. 3. (two words) plants send out root systems, fine roots find their way into cracks.
  2. 5. process that presses sediment together
  3. 15. a rock that explodes out of underwater volcanos
  4. 16. cools above the earths surface
  5. 17. (two words) made up of dead plant matter or animal debris
  6. 18. when particals are broken down and carried away
  7. 19. (two words) liquid layer made up of iron
  8. 22. blanket of gas surrounding a planet
  9. 25. mineral grains aranged in randomly
  10. 26. as underlying rock layers are exposed, there is less pressure on them and the expand.
  11. 27. (two words) it is caused by gases or acids
  12. 28. thinnest layer of the Earth
  13. 29. (two words) the hottest part of the earth
  14. 30. volcanic glass thats cools too fast for crystals to form
Down
  1. 1. glues particals of sediments together
  2. 2. the softer part of the mantle that the tectonic plates float on
  3. 4. process of breaking down rocks
  4. 6. (two words) pollutionns reaches the clouds causing it
  5. 7. (two words) cracking of rock by the expandsion of water as it freezes
  6. 8. thickest part of the Earths layers
  7. 9. a rock that has small visable crystals
  8. 10. the process of scraping or wearing away fine particals of rock.
  9. 11. cools beneath the Earths surface
  10. 12. (two words) proccess that breaks down a rock or mineral into smaller pieces
  11. 13. formed when magma or lava cools and chrystallized.
  12. 14. forms when an existing rock is changed by heat, pressure or chemical reactions
  13. 20. rocks made out of material that comes from rocks or remains of living things
  14. 21. explodes out of volcanos
  15. 23. grains aranged in parallel layers of bands
  16. 24. a person who looks at mineral composition, colour and texture of a rock