What causes the formation of new ocean floor?
New ocean floor is created at mid-ocean ridges where two tectonic plates are spreading apart. This is also known as a divergent plate boundary.
Scientists have observed the beginnings of a new ocean basin in the Afar desert in the northeast region of Ethiopia. New ocean basins are still being formed at the Mid-Ocean Ridge in the Atlantic Ocean. This process involves the formation of new basalt. The process of subduction counter-balances the aforementioned, destroying older parts of the ocean floor. This is formally known as sea-floor spreading.