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15 January, 18:54

What is the last step in the formation of new oceanic crust?

Magma rises from the earth's mantle.

The erupting lava causes the original seafloor to push outward, creating a mid-ocean ridge.

Tectonic plates must move apart.

Underwater sea vents cause currents that break off the continental crust, forming oceans in between.

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Answers (2)
  1. 15 January, 21:40
    0
    Underwater sea vents cause currents that break off the continental crust, forming oceans in between.

    I think? I Apologize if it's incorrect. I just put the in order by memory
  2. 15 January, 22:09
    0
    The answer is 1 magma rises from the earth's mantle.
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