Ridge and rise system are over 40,000 miles (65,000 kilometers) long and are found running through every ocean.
The gigantic mid-ocean ridge system is a chain of continuous submarine volcanoes that meanders around the world like the seams in a baseball, stretching nearly 40,000 miles. Mid-ocean ridges occur along divergent plate boundaries where new ocean floors form as the Earth's tectonic plates spread.
When the plates separate, lava rises to the seafloor and huge volcanic eruptions of basalt occur. Spreading speed affects the shape of the ridge. Slower spraying speeds result in steeper, more irregular terrain, while higher spraying speeds result in wider profiles and gentler slopes.
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