EXTREMELY WEIRD

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Across
  1. 3. A piece of useful advice
  2. 5. A swim training device or swimming aid
  3. 8. Very strange
  4. 9. The soft, grey powder that remains when something has burnt
  5. 13. A surface or piece of land that is high at one end and low at the other
  6. 14. An organized event in which people try to win a prize by being the best, fastest, etc
  7. 16. To turn from something solid into something soft or liquid, or to cause something to do this
  8. 17. To take part in a race or competition
  9. 18. How fast something moves or happens
Down
  1. 1. Something that is very popular for a short time
  2. 2. A dangerous part of a river that flows very fast because it is steep and sometimes narrow
  3. 4. An international competition in a particular sport or activity for people all around the world
  4. 6. Towards the direction that is opposite to the one in which you are facing or opposite to the usual direction
  5. 7. If a volcano erupts, it suddenly throws out smoke, fire, and melted rocks
  6. 10. The flat surface on the lowest side of something
  7. 11. To cause someone or something to stop doing a particular activity or stop being active for a period of time in order to relax and get back your strength
  8. 12. Giving protection
  9. 15. To order, limit, or rule something, or someone's actions or behaviour