Large estuaries are more common on a(n) coastline.

Submergent...Large estuaries are more common on a submergent coastline.

True as the lakes are a marine body. also there's no difference in lake and ocean except for the size.

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.