Air
is
made
of
____________________
and
therefore
air
has
a
mass
.
The
force
of
____________________
pulls
the
air
molecules
____________________
.
Air
pressure
is
like
a
human
pyramid
because
both
have
more
matter
at
the
____________________
and
less
matter
at
the
top
.
A
human
pyramid
and
air
pressure
also
have
more
pressure
at
the
bottom
and
less
at
the
____________________
as
the
weight
of
the
matter
pushes
down
.
Your
ears
may
____________________
as
you
change
altitudes
because
the
air
pressure
inside
your
head
and
outside
your
head
is
____________________
and
has
to
balance
out
.
It
is
harder
to
____________________
at
the
____________________
of
a
mountain
because
there
is
____________________
air
pressure
and
therefore
less
oxygen
to
breathe
.
Air
pressure
is
greater
with
____________________
altitude
because
there
are
more
air
____________________
pushing
downward
due
to
the
force
of
gravity
,
making
the
air
more
dense
.
Air
pressure
____________________
the
higher
into
the
atmosphere
you
go
.
Lastly
,
molecules
hold
and
transfer
heat
.
If
there
are
less
molecules
at
the
top
of
a
mountain
,
the
____________________
at
the
top
of
the
mountain
will
be
much
____________________
.
