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a rock found at the base of a volcano contains air pockets. what is the best explanation for why this rock is porous

User AgentP
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Lava Rock is my favorite red volcanic mulch; leaching a tiny amount of nutrients, this ... The volcanic rock cools on contact with the air, complete with air pockets. ... The porous air filled rock also has a high water holding capacity as the moisture will stick ... In almost a complete contradiction, lava rock has very good drainage.

User Nikhil Raghavendra
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