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- From: dodson@ac.dal.ca
- Newsgroups: sci.geo.geology
- Subject: Re: rising sea level & continetal drift
- Message-ID: <1992Nov16.144413.8933@ac.dal.ca>
- Date: 16 Nov 92 18:44:12 GMT
- References: <97619@netnews.upenn.edu> <1e734kINN5vh@crcnis1.unl.edu>
- Organization: Dalhousie University, Halifax, Nova Scotia, Canada
- Lines: 24
-
- Somebody (I accidentally erased their names) asked:
- >>I have a question about the rising sea level......I'm told that the sea level
- >>has risen quite a bit in the past few hundred years. Could this rise in sea
- >>level have to do with the moving continents? Could the total amout of ocean
- >>floor be decreasing? Something like that would cause a rise in sea level.
-
- And someone else (again, sorry; I'm new at this) replied:
- >
- > Anything on the scale of a few hundred years is far too fast for plate
- > tectonics to have any effect. Global sea level changes seem to be almost
- > entirely the result of the presence/absence/changing volume of the glaciers,
- :Actually, Both of these processes play a role. The current sea
- :level rise is probably due to melting icecaps, but plate tectonics
- :can raise sea level quite a bit, especially when a supercontinent
- :just breaks apart and a new mid-oceanic ridge is created. Ridges
- :displace a huge volume of water, so when a new one comes into
- :being, it's just like stepping into a tub - the water level
- :rises. Of course, this takes a long time, and wouldn't be
- :important on a scale of hundreds of years. Still, it's kind
- :of neat, I think.
- -----------------------
- What disclaimer?
-
- Replies? dodson@ac.dal.ca
-