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How are new sections of the Earth's crust formed?

User Olanod
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Answer:

What does plate tectonic theory describe?

Step-by-step explanation:

User Yez
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Answer: Mid-ocean ridges are the boundaries between tectonic plates and are the place where the plates spread apart from each other. Magma from the underlying mantle erupts at the edges, then cools and solidifies to form a new ocean crust.

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User Mohana B C
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