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It was about 4 billion years ago, that the Earths oceans formed
the earth can be organized into 4 oceans, 7 seas, and 7 continents
it creates waves sometomes tsunami's
precambrian era
size of island ,continents, and body of water.
Moving plates in the earths mantle.
It was about 4 billion years ago, that the Earths oceans formed
Earths crust extend deeper below the continents than below the oceans basins (or at least this is what I think).
There is land beneath the oceans, tectonic plate boundaries separate land masses.
One third is surface and the rest is the sea.
because they formed first along with the layers inside the earth
the atmosphere oceans and continents