Here's why:

* Divergent boundaries: At these boundaries, tectonic plates move apart from each other.

* Magma upwelling: As the plates separate, magma from the Earth's mantle rises to the surface.

* New crust formation: The magma cools and solidifies, creating new oceanic crust. This process is called seafloor spreading.

* Ridge formation: Over time, the continuous accumulation of new crust forms a long, elevated feature known as an ocean ridge.

Key characteristics of ocean ridges:

* Mid-ocean ridges: Most ocean ridges are located in the middle of ocean basins.

* Volcanic activity: Volcanoes are common along ocean ridges due to the rising magma.

* Hydrothermal vents: These release hot, chemically-rich water, supporting unique ecosystems.

* Earthquakes: Earthquakes are frequent along ocean ridges due to the plate movement.

Let me know if you'd like to know more about ocean ridges or divergent plate boundaries!