What is formed at a divergent plate boundary?
A mountains
B sedimentary rocks
C metamorphic rocks
D oceanic crust
D oceanic crust
At a divergent plate boundary, the correct answer is option D: oceanic crust.
Divergent plate boundaries are locations where two tectonic plates move away from each other. This movement causes the underlying mantle to rise and create new crustal material, which primarily consists of basaltic lava. As the molten magma cools and solidifies upon contact with the seawater, it forms new oceanic crust. This process contributes to the continuous expansion of the seafloor and the formation of mid-ocean ridges.