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?"

Input: Consider Input: Fact: Allergens can trigger asthma attacks.

Output: Asthma attacks can be triggered by?


Input: Consider Input: Fact: When water reaches zero degrees Celsius, it expands.

Output: What happens when water reaches zero degrees Celsius?


Input: Consider Input: Fact: uneven heating of the Earth 's surface causes a movement of air.


Output: Uneven heating of the Earth 's surface causes a movement of what?