What geologic process generates the world's longest undersea mountain chain called the Mid-Atlantic Ridge?

Question

volcanic hotspots create chains of mountains that become islands

divergent plates spread apart, and magma pushes up and creates undersea mountains

folding and breaking of undersea layers until they form ridges or mountains

ocean sediment builds up over millions of years

Answer 1

The geologic process that generates the world's longest undersea mountain chain, called the Mid-Atlantic Ridge, is that divergent plates spread apart, and magma pushes up and creates undersea mountains. This occurs at tectonic plate boundaries where the plates are moving away from each other, allowing magma from the mantle to rise and solidify, forming new oceanic crust and creating the ridge.