What is the difference between the adding of new rock at a divergent plate boundary and volcanic activity?

They never really separate because magma continuously moves up from the mantle into this boundary, building new plate material on both sides of the plate boundary.

This submarine volcanic activity accounts for roughly 75% of the average annual volume of magma that reaches the Earth’s crust. Most submarine volcanoes are found on ridges thousands of meters below the ocean surface.

Explanation:

blue

light-years

magnitude

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.