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: if a mineral can be scratched by a fingernail then that mineral is soft

SOLUTION: Which is likely considered soft?

PROBLEM: Fact: sedimentary rocks are formed from sediment compacting together

SOLUTION: At the beach you are likely to find this type of stone:?

PROBLEM: Fact: electricity causes less pollution than gasoline

SOLUTION:
Electricity causes less pollution than what?