Completely off topic now...I think you will find that yes, rocks are
compressible. But water is not, at least for all intents and purposes.

Even at the bottom of the ocean where there is immense pressure, the
weight of water per cubic volume, is exactly the same as at sea level.

On Wednesday, May 14, 2003, at 04:58  AM, Andrew Grebneff wrote:

> Everything is compressible (geologists know this well). Water. Even
> rock. But an engine ain't strong enough to do the trick, hence piston
> & rod damage.