<P> In plate tectonics , a divergent boundary or divergent plate boundary ( also known as a constructive boundary or an extensional boundary ) is a linear feature that exists between two tectonic plates that are moving away from each other . Divergent boundaries within continents initially produce rifts which eventually become rift valleys . Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges . Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill . </P>
<P> In plate tectonics , a divergent boundary or divergent plate boundary ( also known as a constructive boundary or an extensional boundary ) is a linear feature that exists between two tectonic plates that are moving away from each other . Divergent boundaries within continents initially produce rifts which eventually become rift valleys . Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges . Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill . </P>
where are most of the divergent boundaries found
where are most of the divergent boundaries found
between oceanic plates
between oceanic plates