Mid-ocean ridges are places where tectonic plates are diverging, or moving apart.

Here's why:

* Seafloor Spreading: At mid-ocean ridges, magma from the Earth's mantle rises up and solidifies, creating new oceanic crust. This process, known as seafloor spreading, pushes the existing tectonic plates away from the ridge.

* Formation of New Crust: The constant creation of new crust at mid-ocean ridges is responsible for the expansion of the ocean floor and the movement of continents over time.

Let me know if you'd like to learn more about mid-ocean ridges or tectonic plate movements!