There are long, underwater mountain chains that divide the sea
floor and generate new sea floor as magma rises and erupts
onto Earth's surface. What are these mountain chains known as?
Magnetic Poles
O Mid-Ocean Ridges

Ocean Trenches

Subduction Zones
The point within the earth where the earthquake originates: *

Mid-ocean ridges are mountain-like geographical features on the ocean floor. They usually line along the divergent boundaries of tectonic plates moving away from each other. This is because as the plates move in opposite direction, the vacuum in between the plates is filled by upwelling magma from the mantle. Usually the texture of the rocks that form these mountain ridges has bands. This is because, before the magma cools, the iron in the magma (due to its ferromagnetic property) aligns with the earths magnetic field. The earth magnetic flux flips over several 1000 years hence these bands orient themselves differently depending on the magnetic field orientation at the time they were formed.

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