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← GeographyWhich catastrophic impact happens because shield volcanoes exceed capacity?
A)Lateral blast forms pyroclastic surge✓
B)Ashfall causes global temperature downturn
C)Lahars induce debris flow hazards
D)Lava fountaining generates volcanic smog
💡 Explanation
Lateral blasts can arise when shield volcanoes become over-steepened; gravitational instability triggers sector collapse leading to rapid decompression, rather than gradual tephra fall, because pressure release isn't uniform, therefore inducing a lateral surge.
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