Jellby wrote:
> That's it. The solid earth can be considered rigid, while the water in
> oceans obviously isn't. 

Except you get tides even when a planet is entirely made of liquid. So 
that's not really it.  It took people a long time to explain why there 
are two tides per day instead of one (given that such was noticed 
thousands of years before Newton was alive), and many of the old 
incorrect explanations still float around as "lies to children".

-- 
   Darren New / San Diego, CA, USA (PST)
    Neither rocks nor slush nor salted rims
    shall keep us from our appointed rounds.

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