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Many extrusive volcanic rocks contain holes which have formed from:

acidic reactions
escaping gases
quartz crystals
underwater eruptions

User Aluko
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2 Answers

6 votes

B or escaping gases would be the answer

User Extmkv
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"escaping gases" would be the correct answer.

These gases would be trapped in the lava, and would bubble and pop as they escaped.
User Joozek
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