Turn the given fact into a question by a simple rearrangement of words. This typically involves replacing some part of the given fact with a WH word. For example, replacing the subject of the provided fact with the word "what" can form a valid question. Don't be creative! You just need to rearrange the words to turn the fact into a question - easy! Don't just randomly remove a word from the given fact to form a question. Remember that your question must evaluate scientific understanding. Pick a word or a phrase in the given fact to be the correct answer, then make the rest of the question. You can also form a question without any WH words. For example, "A radio converts electricity into?"

Q: Fact: matter vibrating can cause mechanical waves.

A: What can vibrating matter cause?
****
Q: Fact: Support structures of a plant are sometimes used to store water.

A: Where is water sometimes stored in a tree or plant?
****
Q: Fact: a fire requires oxygen to combust.

A:
what does fire require oxygen for?
****