Familiar Talks on Science: World-Building and Life; Earth, Air and Water.Gray, Elisha
Science
Familiar Talks on Science: World-Building and Life; Earth, Air and Water.
Gray, Elisha
Science
In some places there were enormous elevations, and in others
correspondingly deep depressions. The water that before was evenly
distributed over the surface of the globe, after the upheavals ran off
into the lower levels, filling up the great valleys, forming the seas,
and leaving about one-third of the land surface uncovered. It must not
be supposed, however, that the appearance of the land was caused by one
grand movement or upheaval, but that it has been going on in successive
stages through long ages of time. This is clearly evidenced by the rock
formations. The deposition of rock strata is still active in the bottoms
of the oceans, although not to the same degree as in former times. When
the upheaval took place the old stratifications were thrown out of
level, but the new ones that were then formed remained in a level
position until they were in their turn disturbed by some subsequent
upheaval.
The laws of gravitation would tend to precipitate the matter held in
suspension by the water straight down to the bottom, toward the center
of the earth, so that the plane of these stratifications would tend to
be parallel to the surface of the water, that is horizontal, until
disturbed. Then they would be tilted in many directions. Hence it will
be easily seen why the seams in the rocks, especially in and near
mountainous regions, do not lie in a horizontal position after an
upheaval, but are found standing at all angles, up to a perpendicular.
Viewed from this standpoint, the solid portion of the old world has gone
all to pieces. Wherever there is a chain of mountains it marks a
breakage in the earth's crust, and these mountains are not all on the
land, but extend under the seas so deeply that they are unable to lift
their heads above the surface of the water. The earth is no longer
round, except in general outline, but broken up into all sorts of
shapes that give the varied conditions of landscape that we find
whichever way we turn.
There are but few volcanoes that are active in this age, while in former
times they extended for thousands of miles. We still have occasional
earthquakes, but undoubtedly they are very slight as compared with those
that shook the earth millions of years ago.
Public-domain text, read in full here on John Shaqi.
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