Magma flows from cracks in the crust at divergent boundaries is the statement describes divergent boundaries. Hence, option D is correct.
What is divergent boundaries?
Divergent boundaries happen when, from the centre, plates are moving apart and formed a new crust by magma that pushes up from the mantle. Newly created oceanic crust is just being periodically removed from the ridge crest by two enormous conveyor belts that are facing one another but slowly moving in opposite directions.
When two tectonic plates separate, a deviant border is generated. As magma rises from the Earth's mantle to the surface and solidifies to create new oceanic crust, earthquakes frequently occur along these borders.
Thus, option D is correct.
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