Question

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question 7
3 pts
at divergent plate boundaries in the ocean, magma rises and melts because of ____.
○ higher temperatures at the surface
○ a decrease in pressure
○ intrusive plutons at the boundary
○ increased silica content of magma

Explanation:

At oceanic divergent plate boundaries, tectonic plates move apart. The asthenosphere beneath experiences reduced pressure as it rises, lowering the melting point of rock even without increased temperature, causing magma formation. Higher surface temperatures, intrusive plutons, and silica content are not the primary causes here.

Answer:

B. a decrease in pressure