The Juan de Fuca Ridge is a mid-ocean ridge, which means it's a site of new oceanic crust formation. Here's how it works:

* Seafloor Spreading: At mid-ocean ridges, magma from Earth's mantle rises up and erupts, creating new oceanic crust. This process is called seafloor spreading.

* Plate Tectonics: The Juan de Fuca Ridge is part of the boundary between the Juan de Fuca Plate and the North American Plate. As these plates move apart, magma rises to fill the gap, creating new crust.

* Formation of Oceanic Crust: The magma that rises from the mantle cools and solidifies, forming a layer of basalt rock. This basalt rock is the primary component of oceanic crust.

So, the Juan de Fuca Ridge creates new oceanic crust through the process of seafloor spreading.