Put the phases of the earth's atmosphere and their causes in order
the atmosphere included nitrogen, oxygen, argon, carbon dioxide, hydrogen, helium, carbon monoxide, ammonia, sulfur dioxide, and methane
the atmosphere included water vapor, sulfur dioxide, carbon dioxide, carbon monoxide, ammonia, and methane
= the atmosphere included thin layer of hydrogen and helium
the solar system was created with certain common elements
= volcanic outgassing spewed chemicals into the atmosphere
= organisms started undergoing photosynthesis adding oxygen to the atmosphere