<P> Oceanic crust is continuously being created at mid-ocean ridges . As plates diverge at these ridges , magma rises into the upper mantle and crust . As it moves away from the ridge , the lithosphere becomes cooler and denser , and sediment gradually builds on top of it . The youngest oceanic lithosphere is at the oceanic ridges , and it gets progressively older away from the ridges . </P>
<P> Oceanic crust is continuously being created at mid-ocean ridges . As plates diverge at these ridges , magma rises into the upper mantle and crust . As it moves away from the ridge , the lithosphere becomes cooler and denser , and sediment gradually builds on top of it . The youngest oceanic lithosphere is at the oceanic ridges , and it gets progressively older away from the ridges . </P>
where is new oceanic crust being created on earth
where is new oceanic crust being created on earth
at mid-ocean ridges
at mid-ocean ridges