The Strange Adventures of a PebbleHawksworth, Hallam
Science
The Strange Adventures of a Pebble
Hawksworth, Hallam
Geology -- Juvenile literature; Physical geography -- Juvenile literature
It comes about like this. One day we see a big stone lying on the
glacier, and when we come that way again several days later this same
stone is standing on a tall pillar of ice. We notice the stone hat is
tilted forward a little, apparently to shade this queer man's face,
which is always turned directly toward the sun. It sits jauntily on one
side--this hat of his--as if he were feeling particularly contented
with himself and the world on this sunny day and had started for a
stroll.
And it really is because the sun is so bright that the hat is tipped.
Moreover it is because of the sunshine that the man takes a stroll. If,
after more days of sunshine, we return we see the same stone further
down the slope of the glacier and apparently standing on the same leg.
"But does he or it actually walk on that leg?"
(The audience, who at first thought I was joking, had begun to believe
I was in earnest.)
Yes, that leg and others. Before this Alpine tourist ends his travels
down to the valleys below he may have, all told, as many legs as a
centipede, but only one at a time. Like the legs of the amœba and the
claws of the crab they are renewed as wanted. A big stone falling from
the mountain side upon a glacier protects the ice beneath from the
sun's rays, so, as the ice melts down around it, the stone is left
standing on a pillar. These "glacier tables" (to use the scientific
term) are formed on the south sides of glaciers where there is the most
sun. Owing to the slant of the rays the rock is heated most on the
south end and so tips in that direction more and more. Finally it falls
off and, in so doing, pitches farther down the slope. Then a new pillar
is formed and the whole process is gone through again.
(If we should get lost up here any one of these snow men will tell us
the way out. The snow man's hat, for the reason stated, always tips
toward the south.)
The stones of the winter lands are not only like human beings in the
fact that they walk, but like _little_ human beings in the fact that
when they are small they can't. In one of the pictures I drew for the
boys and girls--that representing the ice pillar from which the stone
has slipped--you may be able to make out a little pebble. It got a
ride because it was hiding under the big stone. Left to itself "it
wouldn't have a leg to stand on," as the saying goes, for small stones
are heated through by the sun and so sink down into the ice and form no
"legs."
[Illustration:
_From a photograph copyrighted by Merl La Voy_
THE RUSH OF THE AVALANCHE
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account