Litawn's puzzle

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Across
  1. 1. a state of matter, like water.
  2. 6. the variable we change in an experiment
  3. 8. the large ball we live on.
  4. 9. when a gas turns into a liquid
  5. 10. something we need to live, and that we drink.
  6. 12. something that already existed but nobody found before.
  7. 14. when a solid turns to a liquid.
  8. 15. something in an experiment
Down
  1. 2. the variable we want to see in an experiment
  2. 3. the variable we keep the same in an experiment
  3. 4. a good hypothesis is testable and _______.
  4. 5. it's hot and cold, and is a long word that starts with a t.
  5. 7. the use of science to solve problems
  6. 9. it rhymes with grass. It's where we are right now.
  7. 10. birds use these to fly.
  8. 11. the water ______ is about how water changes states.
  9. 13. something that someone made.