Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Fact: an ocean is a source of heat and moisture for a hurricane
A hurricane is growing on the east coast, and it's coming off of the ocean, as they do. By the time the hurricane hits the east coast, it will have built up quite a bit, and this is because of?

Fact: as elevation of a place decreases , how much a flood will affect that place will increases
At high elevations, there is little risk of flooding, but at low elevations, what will happen?

Fact: if a tree falls then sunlight becomes available to the surrounding plants

Which would block the most sunlight?