Itsnotzerobecausethewaterissaltythesaltdepressesthefre

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Unformatted text preview: Calving
 ‐if
glaciers
terminate
in
oceans
they
float
–ice
is
less
dense
than
water
 ‐in
addition
to
melting,
the
ice
front
can
retreat
from
calving
–the
process
by
which
large
icebergs
are
 formed
by
breaking
off
the
front
of
a
glacier
 
 show
waterline
movie
 
 ‐a
healthy
glacier
will
keep
the
terminus
position
in
the
same
place
while
ice
advances
and
is
removed
 through
calving
 ‐an
unhealthy
glacier
will
undergo
retreat
of
the
terminus
as
calving
occurs
in
excess
of
the
amount
of
ice
 supplied
from
upstream
 
 Glaciated
landscapes
 ‐much
of
the
northern/mountainous
regions
of
the
world
are
shaped
by
the
action
of
glaciers
(~30%
of
 the
Earth’s
surface)
 
 Erosion:
 ‐glaciers
act
like
plows
as
they
advance,
scraping
the
bed
over
which
they
lie
plucking
out
boulders
from
 bedrock.

 ‐unlike
a
stream
which
transports
sediment
in
different
parts
of
the
stream
based
on
grainsize
a
glacier
 transports
sediment
in
an
unsorted
fashion
–large
boulders
are
intermixed
with
sands/gravels
 ‐as
a
result,
glacial
landforms
typically
contain
unsorted
materials
of
multiple
grainsizes
 
 Q:
where
do
you
think
most
of
the
erosion
will
take
place
on
a
valley
glacier?
 ‐along
the
edges
where
the
ice
is
in
contact
with
the
bed
 
 ‐most
of
the
debris
on
the
surface
of
a
glacier
comes
from
rockfalls
from
the
adjacent
valley...
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This note was uploaded on 10/11/2012 for the course UGS 302 taught by Professor Staff during the Fall '08 term at University of Texas.

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