1. The earth for become hard atmosphere fill with oxygen oceans to form. I think what things had to happen before life could be sustained. So in order for animals and human life to take hold, the earth would have to be able to hold them, it would have to be born and have a crust, it would have to have an atmosphere and water and food
2. That is most important in the terms of the earths crust and oceans and the atmosphere. It is one of the biggest peice in geologic time and most important.
3. Yes it is very significant.
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