4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks.
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4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks.
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Answer:
As the seafloor spreads apart, magma moves upward and flows from the cracks. It becomes solid as it cools and forms new seafloor. As new seafloor moves away from the mid-ocean ridge, it cools, contracts, and becomes denser. This denser, colder seafloor sinks, helping to form the ridge.
Explanation:
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