2010
1980
INTRODUCTORY
GEOLOGY
CLIMATE
CHANGE
with
data
that
can
be
downloaded
from
NSIDC.
To
do
this,
follow
the
instructions
in
Figure
6.6.
In
this
case,
steps
two and
three
are
the
same
and
you
can
easily
cal-
culate
slope
using
the
original
data.
é
4
Sea
Ice
Extent
E3.75
4.0
million
square
km
—
3.5
million
square
km.
2
3
@
—
2
Ll
A
Ll
L
L
A
¥
1975
1980
1985
1990
1995
2000
2005
2010
Time
1.
Based
exclusively
on
the
data
provided
and
your
graph,
what
conclusion
would
you
make
regarding
climate
change?
a.
Sea
ice
is
expanding,
which
indicates
an
increase
in
temperature
b.
Sea
ice
is
expanding,
which
indicates
a
decrease
in
temperature
c.
Sea
ice
is
contracting,
which
indicates
an
increase
in
temperature
d.
Sea
ice
is
contracting,
which
indicates
a
decrease
in
temperature
2.
What
is
slope
of
the
line
of
best
fit
for
this
data?
a.
0.008
million
square
kilometers
per
year
b.
0.05
million
square
kilometers
per
year
¢.
-0.05
million
square
kilometers
per
year
d.
0.017
million
square
kilometers
per
year
e.
-0.17
million
square
kilometer
per
year
f.
0.033
million
square
kilometer
per
year
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