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← GeographyWhich outcome occurs when volatiles rapidly exsolve during magma ascent?
A)Pyroclastic flow generation on steep slopes✓
B)Slow, effusive lava flow formation
C)Formation of pillow basalt structures
D)Creation of lahar mudflows in valleys
💡 Explanation
Pyroclastic flows occur because rapid volatile exsolution increases gas pressure exceeding magma strength; therefore a sustained eruption generating heated ash flows develops, rather than lava domes or structures. Pillow basalt forms through cooling, not exsolution.
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