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Sea- Floor Spreading molten material erupts through the valley that runs along the center of some mid-ocean ridges. This material hardens to form the rock of the ocean floor. Mid-ocean ridges an undersea mountain chain where new ocean floor is produced.

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9y ago
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9y ago

Magma pushed up from the mantle hardens to form new rock at mid-ocean ridges.

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12y ago

tectonic plates

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12y ago

Columnar basalt.

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11y ago

magma

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Q: Hardens to form new rock at mid-ocean ridges?
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