The newest parts of Earth's crust are primarily found at mid-ocean ridges, where tectonic plates are diverging and magma from the mantle rises to the surface to create new oceanic crust. The Mid-Atlantic Ridge is a prominent example of this process, which is occurring along this underwater mountain range that stretches north to south through the Atlantic Ocean. Other notable locations include the East Pacific Rise and the Indian Ocean ridge systems.
In addition to mid-ocean ridges, new crust can also form in volcanic regions, such as hotspots, where magma rises through the mantle to create islands or volcanic landforms, like the Hawaiian Islands.
Overall, active geological processes like seafloor spreading and volcanism are key in the formation of new crust.