Seas arise at places where the earth's crust cracked open due to expansion. Around 200million years ago the Atlantic was formed in this way. Today in East Africa, a crack from Malawi toethiopia has formed as a result of the eruption of a volcano 🌋. If the soil sinks further, water from the areas Will enter the eregion to give rise to a water body. This has already happened in the case of Red sea, the continuation of the East African rift system,.If the plate continues to expand, then at some point of time it breaks completely giving rise to a long mid-ocean volcanic ridge.
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