The occurrence of high-heat flows at the ridge center provides evidence of the A) destruction of the continental crust B) destruction of the oceanic crust C) existence of rising mantle convection currents D) existence of ancestral mountains

Answer volcanic outgassing;

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.