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Linda Moss's avatar

Pumice.

Underground the magma gets compressed along with lots of carbondioxide gas -- Like a carbonated beverage.

Then when the pressure is suddenly released in an eruption -- you have frothy lava like an erupting root-beer bottle.

It hardens into pumice, a rock so full of air bubbles that yes, it floats.

The world is an interesting place :)

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gingerwentworth1's avatar

That's how wild animals shake hands!!!

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