What is sea-floor spreading, and what is its importance? Where would older rock be found on the sea floor?

The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side

According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).

That is the correct answer to the question, why is the southern portion of the ring of fire so complex?