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210
The Fairy-Land of Science
·
Arabella B. Buckley
108
Therefore,
if
ice
did
no
more
than
carry
these
stone
blocks,
it
would
alter
the
face
of
the
country;
but
it
does
much
more
than
this.
As
the
glacier
moves
along,
it
often
cracks
for
a
considerable
way
across
its
surface,
and
this
crack
widens
and
widens,
until
at
last
it
becomes
a
great
gaping
chasm,
or
crevasse
as
it
is
called,
so
that
you
can
look
down
it
right
to
the
bottom
of
the
glacier.
Into
these
crevasses
large
blocks
of
rock
fall,
and
when
the
chasm
is
closed
again
as
the
ice
presses
on,
these
masses
are
frozen
firmly
into
the
bottom
of
the
glacier,
much
in
the
same
way
as
a
steel
cutter
is
fixed
in
the
bottom
of
a
plane.
And
they
do
just
the
same
kind
of
work;
for
as
the
glacier
slides
down
the
valley,
they
scratch
and
grind
the
rocks
underneath
them,
rubbing
themselves
away,
it
is
true,
but
also
scraping
away
the
ground
over
which
they
move.
In
this
way
the
glacier
becomes
a
cutting
instrument,
and
carves
out
the
valleys
deeper
and
deeper
as
it
passes
through
them.
You
may
always
know
where
a
glacier
has
been,
even
if
no
trace
of
ice
remains;
for
you
will
see
rocks
with
scratches
along
them
which
have
been
cut
by
these
stones;
and
even
where
the
rocks
have
not
been
ground
away,
you
will
find
them
rounded
like
those
in
the
left-hand
of
the
Frontispiece,
showing
that
the
glacier-
plane
has
been
over
them.
These
rounded
rocks
are
called
"roches
moutonnees,"
because
at
the
distance
they
look
like
sheep
lying
down.
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