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question 15 of 20 :
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image of mid - oceanic ridge, plate 1, plate 2, magma, convection current, and text: plate 1 and plate 2 move apart. magma rises, cools, and solidifies forming new igneous rock. this is sea floor spreading and is a constructive plate boundary.

1. how does sea floor spreading relate to supercontinents?

○ a. it creates new land structures in the middle of the ocean.
○ b. it turns continental crust into oceanic crust.
○ c. it lowers the overall water level in the ocean so land masses can join together.
○ d. it leads to the new formation of tectonic crust under the water that either pushes continents together or pulls them apart.
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Explanation:

• Option A: Creating new land structures in the ocean is about sea - floor spreading's own feature, not its relation to supercontinents. Eliminate A.
• Option B: Sea - floor spreading forms oceanic crust from magma, not turn continental crust to oceanic crust. Eliminate B.
• Option C: Sea - floor spreading has no relation to ocean water level change for supercontinent formation. Eliminate C.
• Option D: Sea - floor spreading forms new tectonic crust (oceanic) at mid - ocean ridges. Convection currents and plate movement from sea - floor spreading can push or pull continents, affecting supercontinent formation (like breaking or forming). This explains the relation.

Answer:

D. It leads to the new formation of tectonic crust under the water that either pushes continents together or pulls them apart.