Select the word from the list that best fits the definition site of sea-floor spreading

Answer;

Mid-ocean ridges

Explanation;Sea-floor spreading is the process by which molten material adds new oceanic crust to the ocean floor.Mid-ocean ridge is an undersea mountain chain where new ocean floor is produced at a divergent plate boundary.Mid ocean ridge occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.

The answer is trial 3.

Iwould have to say sorry i can't elaborate more. hope this though!