Question: Is the most common gas in the Earth's atmosphere non-flammable?, Answer:Yes, Description of Atmosphere of Earth: Layer of gases surrounding the planet Earth, Fact1: Nitrogen is the most common gas in the Earth's atmosphere., Fact2: Nitrogen isn't flammable.
Step1: What is the most common gas in the Earth's atmosphere?, Step2: Is #1 non-flammable?, Wikipedia page for step 1: Nitrogen, Wikipedia page for step 2: Nitrogen, not_definitive_answer: False, incorrect_answer: False