Answer: The correct answer is D
Explanation: Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. ... At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.
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Correct answer is The horse started out the size of a small dog and evolved to the larger modern horse.
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