Question
1
(20
points)
Which
of
the
following
statements
is
correct
about
isotopes
for
ice
cores?
()
Heavier
isotopes
are
associated
with
warmer
air
temperatures
O
Lighter
isotopes
are
associated
with
warmer
air
temperatures
Question
2
(20
points)
Which
of
the
following
statements
is
correct
about
isotopes
for
sea
cores?
()
Heavier
isotopes
are
associated
with
warmer
air
temperatures
Q
Lighter
isotopes
are
associated
with
warmer
air
temperatures
Question
3
(20
points)
Which
of
the
following
statements
is
incorrect?
At
the
end
of
an
ice
age,
carbon
dioxide
concentrations
increase
which
increases
air
temperatures
due
to
the
greenhouse
effect.
Increases
in
solar
radiation
at
high
latitudes
due
to
orbital
variations
trigger
ice
sheet
melting.
The
increase
in
global
temperatures
at
the
end
of
an
ice
age
is
seen
in
ice
cores
records
but
not
sea
core
records.
Question
4
(20
points)
Which
of
the
following
statements
is
incorrect?
O
Trees
grow
larger
(that
is,
have
wider
rings)
when
temperatures
are
warmer.
Q
Tree
ring
records
can
only
reach
as
far
back
in
time
as
the
oldest
living
tree.
The
last
decade
is
almost
certainly
the
warmest
the
Earth
has
been
for
the
last
400
years.
