If the ocean floor were created at divergent boundaries at a faster rate than it is destroyed at convergent boundaries, the Earth's volume would increase. A divergent boundary is where two tectonic plates move away from each other; this is where earthquakes and magma arise. During the divergence of tectonic plates, the crust is weak and collapses, leaving more space for the magma from the mantle to be inserted, which leads to an increase in the surface's volume.
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