Image: Pumice on 20 dollars
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Description: A six-inch-wide piece of pumice on a rolled-up US $20 bill. This demonstrates the extreme low density of pumice.
Title: Pumice on 20 dollars
Credit: Own work
Author: Robert DuHamel (Rsduhamel)
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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