Question: What are the 3 most common gasses in earth's atmosphere?

Disambiguated questions and answers:
context: The discovery of nitrogen is attributed to the Scottish physician Daniel Rutherford in 1772, who called it "noxious air". Though he did not recognise it as an entirely different chemical substance, he clearly distinguished it from Joseph Black's "fixed air", or carbon dioxide. The fact that there was a component of air that does not support combustion was clear to Rutherford, although he was not aware that it was an element. Nitrogen was also studied at about the same time by Carl Wilhelm Scheele, Henry Cavendish, and Joseph Priestley, who referred to it as "burnt air" or "phlogisticated air". Nitrogen gas was inert enough that Antoine Lavoisier referred to it as "mephitic air" or "azote", from the Greek word (azotikos), "no life". In an atmosphere of pure nitrogen, animals died and flames were extinguished. Though Lavoisier's name was not accepted in English, since it was pointed out that almost all gases (indeed, with the sole exception of oxygen) are mephitic, it is used in many languages (French, Italian, Portuguese, Polish, Russian, Albanian, Turkish, etc.; the German "Stickstoff" similarly refers to the same characteristic, viz. "ersticken" "to choke or suffocate") and still remains in English in the common names of many nitrogen compounds, such as hydrazine and compounds of the azide ion. Finally, it led to the name "pnictogens" for the group headed by nitrogen, from the Greek πνίγειν "to choke".
question: What is the most common gas in earth's atmosphere by volume?
short_answers: N

N2

dinitrogen

nitrogen

nitrogen gas
wikipage: Nitrogen

context: Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula . Diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere. As compounds including oxides, the element makes up almost half of the Earth's crust.
question: What is the second most common gas in earth's atmosphere by volume?
short_answers: Diatomic oxygen gas

O2

oxygen gas

Oxygen
wikipage: Oxygen

context: No context provided
question: What is the third most common gas in earth's atmosphere by volume?
short_answers: Argon

argon gas

Long answers:
knowledge: content: The atmosphere of Earth, commonly known as air, is the layer of gases retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere.
wikipage: Atmosphere of Earth

content: By mole fraction (i.e., by number of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.[8] Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
wikipage: Atmosphere of Earth
long_answer: Earth's atmosphere, or air, is made up of gases. By mole fraction, or by the number of molecules, the planet's dry air contains 78.08% nitrogen, making it the most common gas in Earth's atmosphere. At 20.95%, oxygen is the second most common gas in Earth's atmosphere. The third most common gas in Earth's atmosphere is argon, with 0.93%.