On Fri, 30 Mar 2007 23:40:25 -0400, Bob Brown . wrote:
On Fri, 30 Mar 2007 Joe Fischer wrote:
On Fri, 30 Mar 2007 22:45:45 -0400, Bob Brown wrote:
If someone can claim a "mile thick" of ice 20K years ago then I guess
this opens the doors for all kind of claims.
Thanks for opening that door for me, and millions of others.
I thought it was well known, just a fact, not meant
to cause controversy.
http://www.cr.nps.gov/archeology/eam/glaciers.htm
And regarding temperature;
"The best evidence seems to suggest that, globally, the average air
temperature was cooler by some 6 to 12° Celsius, and that daily
temperature at latitudes such as Indiana fluctuated seasonally almost as
much as they do today."
http://igs.indiana.edu/Geology/ancie...rame/index.cfm
Joe Fischer
ONE MILE THICK ICE?
Are you certain?
No, I have to take the word of people who drill
holes in the present ice sheets on Greenland and
the continent of Antarctica for what is there now,
and the opinion of geologists who study past eras.
The first link I mentioned above shows the
area covered by ice at three times in the relatively
recent past by clicking on the different age markers,
to view it in a browser, double click the underlined url.
Here is a link that describes the thickness of
the Greenland ice sheet;
http://en.wikipedia.org/wiki/Greenland_ice_sheet
Here is a link that shows a graph of past
temperatures which began warming 18000 years ago,
and have been fairly stable in the last 10000 years,
and that is topical here.
The thickness real time thickness of the ice
sheets depends more on how much snow they receive,
because most of the melting is on the edges, and the
ice flows outward from the thickest part where it is
presently more than two miles thick, pressure melts
the ice and it flows in streams under the ice.
http://earthobservatory.nasa.gov/Stu...logy_IceCores/
Here is a link that talks about ice sheets in the
past and estimates of the future at different temperatures;
http://earth.usc.edu/~geol150/variab...icesheets.html
Joe Fischer