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: cows only eat plants
If a cow is offered a choice, it will turn down?

Fact: the looseness of soil increases the amount of oxygen in that soil
If soil is loose, it makes it what for oxygen to get in?

Fact: coal is used to produce electricity by burning in coal-fire power stations

Within a power station meant to process coal, electricity is?