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?"

[EX Q]: Fact: If soil is permeable then a compound of hydrogen and oxygen easily flows through that soil.
[EX A]: If soil is permeable then what easily flows through the soil?

[EX Q]: Fact: a sifter is used for separating flour.
[EX A]: What is used for separating flour?

[EX Q]: Fact: Fuel made from corn is being used today in cars.
[EX A]:
Which product is widely used today to make fuel for cars?