Mid-Ocean Ridges are underwater mountain ranges in the world's oceans. They have a valley called a rift running down its spine. They are caused by sea-floor spreading which is the process of the sea-floor spreading letting the magma seep through the crack and creating new land. The mid-ocean ridge system is the longest mountain range in the world. Lava is brought up to the ocean, and more lava is created, push the plates a little more. These mountains trace where the Earth's plates moved apart from each other.
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