[Rockhounds] Why Pumice Floats and Why it Sinks

[Tim Fisher]

We here in northwest Oregon/southwest Washington could have told them that.
if you look long enough you can find pieces of Mt St Helens pumice from the
big blow in 1980 in the Cowlitz and Columbia Rivers to this day. Chuck them
in and they float.

Tim Fisher
Orerockon.com


-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On
Behalf Of Paul
Sent: Wednesday, May 31, 2017 5:35 PM
To: Rockhound List
Subject: [Rockhounds] Why Pumice Floats and Why it Sinks

How X-rays helped to solve mystery of floating rocks in the ocean.
Experiments at Berkeley Lab show scientists how pumice can  remain buoyant
for years, UC Berkeley, Berkeley Lab
http://newscenter.lbl.gov/2017/05/23/how-x-rays-helped-to-solve-mystery-of-f
loating-rocks/
https://www.sciencedaily.com/releases/2017/05/170523144110.htm

Fauria, K.E., Manga, M. and Wei, Z., 2017. Trapped bubbles keep pumice
afloat and gas diffusion makes pumice sink.
Earth and Planetary Science Letters, 460, pp. 50-59.
http://seismo.berkeley.edu/~manga/fauriaetal2017.pdf

Yours,

Paul H.
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