Minority Business. Development Agency. Mission Statement. The Minority Business Development Agency is an entrepreneurially-focused and innovative organization, committed to minority business enterprise and wealth creation.
Freebase (5.00 / 1 vote) Rate this definition: Mid-ocean ridge. A mid-ocean ridge is a general term for an underwater mountain system that consists of various mountain ranges, typically having a valley known as a rift running along its spine, formed by plate tectonics.
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 gabbro. They are formed by two oceanic plates moving away from each other. The rocks making up the crust below the seafloor are youngest along the axis of the ridge and age with increasing distance from that axis.