How did the Earth’s ocean form?
According to scientists, at the down of its existence, about 4.5 billion years ago, Earth had no ocean as it was too hot for water to accumulate in liquid form.
Earth eventually started to cool below the boiling point of water, allowing the early ocean to form around 3.8 billion years ago.
There’s some debate around how water arrived on Earth in the first place.
One theory is that volcanic activity expelled water vapor and other gases from the planet’s interior, where it already existed.
Another suggests that icy comets deposited water when they crashed into the early planet.
The reality could be a combination of these theories, plus one other that involves the major collision event that is believed to have created the moon.
Regardless of the ultimate explanation, the Earth’s specific location in the solar system happens to be the perfect place for water to exist in all three phases — ice, liquid and water vapor.
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