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 the type of plant called when its leaves seasonally turn color and fall off? Answer: deciduous plant
[EX A]: In a deciduous plant, leaves seasonally turn color and fall off the plant. They are replaced with new leaves later in the year.

[EX Q]: Question: What two gases are the main components of air? Answer: nitrogen and oxygen
[EX A]: A: Other examples of liquid mixtures include salt water and salad dressing. Air is a mixture of gases, mainly nitrogen and oxygen. The rock pictured in the Figure below is a solid mixture.

[EX Q]: Question: What forces keep the moon orbiting the earth? Answer: gravitational
[EX A]:
This photograph was taken by Apollo 8 crewmember Bill Anders on December 24, 1968, showing the Earth rising above the lunar surface. Gravitational forces keep the moon orbiting the Earth.