Steel
is
an
essential
part
of
our
everyday
life
.
It
takes
part
of
the
structures
of
the
buildings
where
we
work
and
live
,
the
home
appliances
that
we
use
,
the
cars
that
we
drive
,
bridges
,
boats
,
planes
,
trains
etc
.
without
it
,
modern
day
life
would
look
a
lot
different
.
Last
year
the
world
steel
____________________
eighteen
hundred
million
tons
of
steel
,
the
equivalent
of
over
5100
____________________
.
So
how
is
possible
to
transform
rocks
in
the
ground
into
one
of
the
____________________
materials
in
the
world
.
