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ankoles [38]
3 years ago
7

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
Geography
2 answers:
Delicious77 [7]3 years ago
5 0

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

Alex73 [517]3 years ago
4 0
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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