The new materials are created along the mid-oceanic ridge in a divergent plate boundary.
In a divergent plate motion, the two plates move in the opposite direction. As a result of which the magma rises and comes out to the surface, that immediately cools and forms basaltic rocks and lavas. This adds new materials to the ocean floor along the mid-oceanic ridge. The rocks near the mid-oceanic ridge are the youngest and the rocks that are away from the mid-oceanic ridge are the oldest. This type of plate boundary is also known as the constructive plate boundary.
