When
you
think
of
examples
of
hi
-
tech
materials
,
composite
materials
come
to
mind
,
such
as
carbon
fibre
,
used
in
aerospace
and
Formula
1
cars
.
But
although
we
think
of
____________________
as
hi
-
tech
and
highly
expensive
,
that's
not
always
true
.
The
earliest
examples
of
composite
materials
were
bricks
made
from
____________________
and
____________________
.
Or
,
to
use
the
correct
composite
terms
,
from
straw
____________________
-
the
structural
network
that
reinforces
the
material
inside
,
and
a
mud
matrix
)
,
the
material
surrounding
the
reinforcement
.
These
terms
explain
what
a
composite
material
is
:
a
matrix
with
a
____________________
material
inside
it
.
A
modern
,
everyday
example
is
____________________
which
has
a
plastic
matrix
reinforced
with
glass
fibres
.
