TASK DEFINITION: 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.
PROBLEM: Fact: many vehicles emit pollution into the air

SOLUTION: Pollution is?

PROBLEM: Fact: melting point means temperature above which a solid melts

SOLUTION: Glass can become a liquid if?

PROBLEM: Fact: the looseness of soil increases the amount of oxygen in that soil

SOLUTION:
If soil is loose, it makes it what for oxygen to get in?