kCh1urryarit kCh1urryarit

17-03-2016
Geography

contestada

About 4 billion years ago, oceans were able to form because _____. cyanobacteria appeared volcanic outgassing helped protect the surface from meteorite bombardment the moon's gravitation cooled the earth the Sun's radiation declined

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andriansp andriansp

29-03-2016

Because Cyanobacteria appeared

Cyanobacteria's excrement formed a lot of oxygen in the atmosphere which make the earth temperature cold

This allow a liquid water to formed on the surface ( because if the temperature is too high, the water will evaporate) and eventually formed oceans

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starlovesabby starlovesabby

13-04-2020

the answer is "volcanic out-gassing helped protect the surface from meteorite bombardment "

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