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: the mass of the sun causes its gravity on Earth.
What causes gravity on the Earth?

Fact: Freshwater biomes have water that contains little or not sodium.
Freshwater biomes contain water that contains little to no what?

Fact: When a hemisphere is tilted towards the sun, that hemisphere grows papaya trees in the sunlight.

When a hemisphere is tilted towards the sun, that hemisphere does what in the sunlight?