ORIGIN OF THE ATMOSPHEREVersión en línea Order the events por Julia Plaza 1 ORIGIN OF THE ATMOSPHERE The amount of oxygen became similar to today’s, which allowed animal life to develop First bacteria capable of photosynthesis appeared and started releasing oxygen into the atmosphere Earth started to cool down and crust became solid Earth’s temperature decreased (<100ºC), water vapor condensed, and water began to accumulate in seas Volcanic eruptions released gases(like CO2) into the atmosphere. Animals, plants couldn't live there The Earth was a hot mass of molten rock with a thin atmosphere made of helium and hydrogen