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What is sea-floor spreading?

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Answer:

The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side. Hope this helps

Step-by-step explanation:

User SNaRe
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Answer:

Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

Step-by-step explanation:

User Dmay
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