Breadcrust bombs are volcanic bombs with a cracked exterior. This is due to initial cooling of the surface followed by further expansion of the interior of the bomb. Which of the following factors is the cause of this expansion?
W) Continued gas exsolution after the surface cools
X) Ice wedging
Y) Reheating when buried by a lava or pyroclastic flow
Z) Columnar jointing
✔️Answer:W) Continued gas exsolution after the surface cools
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