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: when a river floods , that river deposits sediment in flood plains
More dirt and sand gets deposited in a flat area near a river whenever?

Fact: December is during the summer in the southern hemisphere
It is hotter in December than other months. Where are you likely located?

Fact: milliliters mL is a unit used for measuring volume generally used for values between 1 and 1000

Millilters mL is a unit generally used for values between 1 and 1000 to measure?