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Its Calisto,Ganymede,Europa, and Io
Europa
Earth, air, fire, and water.
Jupiter's four largest moons are known as the Galileans. They are individually named Io, Europa, Ganymede, and Callisto, named my Simon Marius in 1610. Ganymede is the largest of these four moons.
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These gases are: nitrogen, oxygen argon, carbon dioxide.
Nitrogen, Oxygen, Carbon Dioxide and Neon are the four main gases in order of percentage.
i know two water vapor and other liquids
Nitrogen Oxygen Carbon dioxide Water vapor Argon
The four most common gases in Earth's atmosphere, are:- Nitrogen, 78%; Oxygen, 21%; Carbon dioxide,0.04%; and Argon, 1%.
These gases are: nitrogen (78,084 %), oxygen (20,9476 %), argon (0,934 %), carbon dioxide (0,0314).
There are more than four gases in air but the four most abundant are nitrogen, oxygen, argon and carbon dioxide. There are others in smaller quantities, e.g. hydrogen, helium, neon, krypton, methane.
Only two of the four halogens are gases at standard temperature and pressure, and both of these, fluorine and chlorine, are very chemically reactive, so that their elemental forms usually do not survive long after they might have entered a local atmosphere.
the two deadly gases 4 billion years ago are the fart and breath stinks......
Io
Galileo Galilei