Hydrogen & carbon dioxide.
The two most abundant gases on Earth are nitrogen and oxygen.
The main gases present in Earth's atmosphere today are nitrogen (about 78%), oxygen (about 21%), argon (about 0.93%), and carbon dioxide (about 0.04%). Other gases such as water vapor, methane, and trace amounts of other gases are also present.
Hydrogen and Helium are the two main gases present in the stars Hydrogen combines with other hydrogen atoms during proton proton cycle
There are not two gases in the layer but one. Ozone is the only gas present in the ozone layer.
Hydrogen and helium were the two primary gases present during the formation of our solar system. These gases dominated the early solar nebula from which the Sun and the planets eventually condensed.
Solvent
The most abundant gases in Earth's atmosphere today are nitrogen (about 78%) and oxygen (about 21%). These two gases make up the majority of our atmosphere, with other gases like argon, carbon dioxide, and water vapor present in smaller amounts.
carbon dioxide, and oxigen
The main gases present in air are nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%), and carbon dioxide (about 0.04%). There are also trace amounts of other gases such as neon, helium, methane, krypton, and hydrogen.
Oxygen, nitrogen, and various other gases are always present in the air. These gases are essential for supporting life on Earth.
There is only oxygen in oxygen. If you mean what gases are present in "air" then it's mostly nitrogen (about 78%), oxygen (about 20%) and argon (.93%) and the other 1.07% is made up of 13 other gases including carbon dioxide and trace amounts of ammonia, to name a few.
Two gases that probably existed in Earth's early atmosphere are ammonia and methane. These gases were likely present in significant quantities before the atmosphere transformed into its current composition.