When were the oldest rocks formed?, How is the event that created oxygen on the planet called?, According to the first theory of scientists what created breathable air? , According to the second theory of scientists what created breathable air?, How many rock samples did scientists study to come up with the second theory?, During which period has magma formed?, How many years after the change in the composition of magma did animals appear?, What is the use of the Ozone layer?, What led to the Ice - Age?.
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