TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The mass remains the same does burning matter affect its mass.

SOLUTION: How does burning matter affect its mass?

PROBLEM: Limestone is insoluble in water, so acid can dissolve it.

SOLUTION: Limestone is insoluble in water, so what can dissolve it?

PROBLEM: Tributaries is the term for small streams.

SOLUTION:
What is the term for small streams?