<P> Mid-ocean ridges are geologically active , with new magma constantly emerging onto the ocean floor and into the crust at and near rifts along the ridge axes . The crystallized magma forms new crust of basalt ( known as MORB for mid-ocean ridge basalt ) and below it , gabbro . They are formed by two oceanic plates moving away from each other . Hydrothermal vents are a common feature at oceanic spreading centers . </P>
<P> Mid-ocean ridges are geologically active , with new magma constantly emerging onto the ocean floor and into the crust at and near rifts along the ridge axes . The crystallized magma forms new crust of basalt ( known as MORB for mid-ocean ridge basalt ) and below it , gabbro . They are formed by two oceanic plates moving away from each other . Hydrothermal vents are a common feature at oceanic spreading centers . </P>
what type of magma formed at mid-ocean ridges
what type of magma formed at mid-ocean ridges
basalt gabbro
basalt gabbro