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mid ocean ridges are formed when the two plates are pulled apart, due to the power of the convection current. lava flows through this newly formed gap and reacts with the water above, forming rock. Leaving an underwater mountain range (the answer is b, sorry for a late response!) 
Histrionicus

Mid-ocean ridges normally form where tectonic plates are - b. diverging.

A mid-ocean ridge is an underwater mountain range, formed by plate tectonics or seafloor spreading.

  • Mid-ocean ridges occur along divergent plate boundaries, where a new ocean floor is created as the Earth's tectonic plates spread apart.
  • A divergent boundary occurs when two tectonic plates move away from each other.
  • Along divergent boundaries, earthquakes are normal and molten rock rises from the Earth's mantle to the surface to form a new oceanic crust.

Thus, Mid-ocean ridges normally form where tectonic plates are - b. diverging.

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