How argon enters and exits the atmosphere?

Argon enters the atmosphere primarily through volcanic eruptions and the radioactive decay of potassium-40 found in the Earth's crust. Once in the atmosphere, argon is a noble gas, meaning it is chemically inert and does not easily react with other substances, allowing it to persist. It exits the atmosphere through processes such as the slow diffusion into the Earth's crust and the absorption by ocean water, but these processes occur at a minimal rate compared to its atmospheric presence. Overall, argon's concentration in the atmosphere remains relatively stable due to its inert nature and limited removal mechanisms.