instruction:
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.
question:
Question: Where is the pressure of gases in the atmosphere at its greatest? Answer: sea level
answer:
The pressure of gases in the atmosphere is greatest at sea level and decreases rapidly as altitude increases.

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Question: Cigarettes are a major source of what kind of chemical substances linked with cancer? Answer: carcinogens
answer:
Courtesy of the CDC/Debora Cartagena. Cigarettes are a major source of chemical carcinogens .

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Question: Which element has atomic number 87? Answer: francium
answer:
Francium has an atomic number of 87. Write the chemical equation for the alpha particle emission of 212Fr. What is the daughter isotope?.