passage: Oh no !
  Your younger sister just mixed up all of your LEGO parts .
  Now you have to put them all back into the original categories .
  How will you do this ?
  You sort them by size and shape until they are each back into their specific place in the tray .
  What do you think you could have called the mess your younger sister created ?
  That s right , it is a mixture .
  Fortunately , it was a physical change and she just made a simple mixture .
  You are able to separate them back into order .
  Its a good thing she did not toss them into the fireplace .
  That would have caused a chemical change as they all melted together .
  If your LEGOs were melted , you would be out of luck for building that next big project .
query_and_answer: What your sister created , what is it called ? || A chemical change
evidences: What do you think you could have called the mess your younger sister created ? That s right , it is a mixture .