What creates new seafloor in the rift valleys?

• Correct Answer: continental drift
• sedimentation
• crust spreading
• seafloor spreading

Explanation: Volcanoes erupt at mid-ocean ridges, such as the Mid-Atlantic ridge. Seafloor spreading creates new seafloor in the rift valleys. This type of volcanism makes all of the ocean floor! Where a hotspot is located along the ridge, such as at Iceland, volcanoes grow high enough to create islands ( Figure below ).

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