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 unit of measure is equal to the amount of work a horse can do in 1 minute? Answer: horsepower
[EX A]: Power may be measured in a unit called the horsepower. One horsepower is the amount of work a horse can do in 1 minute, which equals 745 watts of power.

[EX Q]: Question: What kind of resource is soil? Answer: renewable
[EX A]: Soil is a renewable resource. Sometimes it is lost faster than it can be replaced.

[EX Q]: Question: The volume of a gas is comprised of about 10% matter. what is the rest? Answer: empty space
[EX A]:
The volume of a gas contains only about 10% matter, with the rest being empty space. Hsub is equal to Hvap.