TASK DEFINITION: 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.
PROBLEM: Question: How many nonpolar bonds does an oxygen molecule have? Answer: 2

SOLUTION: An oxygen molecule has two nonpolar bonds. This is called a double bond. The two oxygen atoms attract equally the four shared electrons.

PROBLEM: Question: By what kind of change can a chemical change be reversed? Answer: another chemical change

SOLUTION: Because chemical changes result in different substances, they often cannot be undone. Some chemical changes can be reversed, but only by other chemical changes.

PROBLEM: Question: What type of waves travel through the body of a planet? Answer: body waves

SOLUTION:
Body waves travel through the body of a planet. Surface waves travel along the surface.