Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: Fission is a type of radioactivity in which large nuclei spontaneously break apart into what? Answer: smaller nuclei
[A]: Fission is a type of radioactivity in which large nuclei spontaneously break apart into smaller nuclei.

[Q]: Question: Liverworts are small plants that grow close to what? Answer: ground
[A]: Liverworts are small plants that grow close to the ground.

[Q]: Question: Which direction from the source do pollutants in an aquifer spread? Answer: outward
[A]:
Pollutants that enter an aquifer spread outward from the source. They spread in the direction the water is moving.