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?"

Fact: Solid materials used to produce electricity by burning in power stations need to be transported first.
Solid materials used to produce electricity by burning in what need to be transported firs?

Fact: Friendship often comes before mating.
What often precedes mating?

Fact: Water that is not tested can have a negative impact on the body.

Water that is not what can have a negative impact on the body?