9kgm3

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Unformatted text preview: have
high
or
low
amounts
of
snowfall?
 ‐actually
have
low
snowfall,
it’s
just
that
it’s
so
cold
all
of
the
year
so
the
snow
that
does
accumulate
does
 not
melt
away
 
 ‐the
snowline
is
not
at
the
same
elevation
everywhere;
near
the
equator,
a
much
taller
mountain
is
 required
to
get
snow
on
it
as
the
snowline
increases
 
 
 Glaciers
 Q:
how
do
glaciers
form?
 
 
 ‐snowfall
gets
compressed
and
does
not
melt
during
summer
 ‐at
the
surface
of
an
ice
sheet
there
is
snow
but
as
you
go
deeper
the
crystals
bond
together
and
it
 becomes
‘firn’
 ‐this
is
compressed
by
the
overlying
snow
to
the
density
of
ice
0.9
kg/m3
 ‐as
compression
increases
(as
you
travel
to
the
deeper
parts
of
the
ice
sheet)
the
crystal
size
grows
 
 Q:
where
are
glaciers
found?
 ‐we
already
established
that
they
form
in
high
altitudes
and
polar
regions
 ‐but
we
also
need
precipitation
–...
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