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← GeographyWhich outcome follows when buoyant magma intrudes brittle lithosphere?
A)Formation of shield volcanoes atop swells✓
B)Decreased regional metamorphic rock production
C)Increased subduction zone earthquake frequency
D)Stabilization of continental transform fault lines
💡 Explanation
Shield volcano formation results because pressure release drives decompression melting—where reducing overburden allows magma ascent—therefore creating broad, gentle lava flows forming shield-like volcanoes, rather than triggering earthquakes or fault stabilization.
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