Question

How did erupting volcanoes contribute to the formation of oceans?

Answer 1

Volcanoes erupt because mantle rock melts. This is the first stage in creating a volcano. Remember from the chapter “Rocks” that mantle may melt if temperature rises, pressure lowers, or water is added.

Answer 2

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Volcanic activity back then would easily have been violent enough to lower global temperatures by a lot, cooling down the average temperature below the boiling point of water (unsurprisingly, there a lot of theories explaining this) and allowing escaped water vapour in the atmosphere to cool down, basically causing a.