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UPLIFTING OF THE SEA
the land gradually sunk, just as the glacial climate
advanced towards its maximum intensity.
But how could the sea rise, seeing that water
always maintains its level ? is a fair question that
may occur to the reader. The answer to this is
very simple. A great accumulation of ice and snow
upon any mass of land must, by its gravitation,
draw the waters of the ocean towards it; will
raise the sea level on the shores of the land that
is thus overtopped with additional matter. The
amount of this uplifting of course depends upon
the quantity of ice and the proximity of the
sea. I will not here trouble the reader with
any attempt to calculate the probable or
possible extent of this raising of the waters, but
merely note that the normal or ordinary sea level
is determined by the gravitation of the whole mass
of the earth, and that the mean distance of this
mass from any given sea surface, or from the
water on any particular sea-shore, is about four
thousand miles; that the force of gravitation varies
inversely with the square of the distance, and
therefore any mass of ice, at a mean distance
of one mile from the water on this shore, will act
with a force 40002, or sixteen million times greater
than the mean force of the whole earth’s attraction.
This would of course be divided by the quantity
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