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: lava is found above the ground
The movement of lava might be compared to that of a?

Fact: bees eat pollen
When we think of bees, we also think of pollen. This is because bees?

Fact: an egg requires warmth to develop

Which is more likely to be able to develop?