Oceanic Spreading
By Earthquake Hazards Program
1996 (approx.)
Detailed Description
An oceanic spreading ridge is the fracture zone along the ocean bottom where molten mantle material comes to the surface, thus creating new crust. This fracture can be seen beneath the ocean as a line of ridges that form as molten rock reaches the ocean bottom and solidifies.
Sources/Usage
Public Domain.
Image from "This Dynamic Earth: The Story of Plate Tectonics"