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.

[EX Q]: Question: What is an ionic bond in nature? Answer: electrostatic
[EX A]: An ionic bond is electrostatic in nature.

[EX Q]: Question: Which type of tides are created when the sun and moon's tides match? Answer: spring tides
[EX A]: When the Sun's and Moon's tides match, there are spring tides. When the two tides are opposed, there are neap tides.

[EX Q]: Question: Two water molecules contain 4 hydrogen atoms and how many oxygen atoms? Answer: 2
[EX A]:
Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.