Answer:
i think it might be A
Explanation:
Mid-ocean ridges form along divergent boundaries aka where two plates are pulling away for one another so I'm assuming it's A "Where two oceanic plates move apart"
Answer: Thermal Equilibrium
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Secondary , or S waves, travel slower than P waves and are also called "shear" waves because they don't change the volume of the material through which they propagate, they shear it