____________________
____________________
is
determining
whether
an
object
or
event
is
older
or
younger
than
other
objects
or
events
.
Two
basic
rules
for
relative
rock
sequencing
;
.
one
,
layers
will
form
____________________
on
top
of
each
other
.
This
means
the
horizontal
layers
on
top
must
be
younger
than
the
horizontal
layers
underneath
it
.
This
is
called
the
law
of
____________________
.
Second
,
for
an
igneous
intrusion
to
break
through
a
layer
,
it
had
to
have
existed
at
the
time
of
the
fault
line
.
If
a
fault
line
/
intrusion
cuts
through
a
layer
,
the
intrusion
or
fault
line
is
____________________
.
This
is
called
the
law
of
____________________
.
Therefore
,
if
rock
layer
A
is
horizontally
on
top
of
rock
layer
B
than
rock
layer
B
is
____________________
.
Furthermore
,
if
an
intrusion
rock
layer
C
cuts
through
both
rock
layer
A
and
B
then
intrusion
rock
layer
____________________
is
the
youngest
,
rock
layer
____________________
is
the
next
youngest
,
and
rock
layer
____________________
is
the
oldest
.
Lastly
,
a
fault
line
D
is
made
and
all
the
rock
layers
shift
.
This
tells
us
fault
line
____________________
is
the
youngest
,
intrusion
rock
layer
____________________
is
the
next
youngest
,
followed
by
rock
layer
____________________
,
and
rock
layer
____________________
is
the
oldest
.
