Steel
?
is
an
essential
part
of
our
everyday
life
.
?
It
takes
part
of
the
____________________
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
____________________
produced
eighteen
hundred
million
tons
of
steel
,
?
the
equivalent
of
over
5100
____________________
building's
.
So
how
is
possible
to
?
transform
?
rocks
in
the
ground
into
one
of
the
____________________
____________________
structural
materials
in
the
world
.
The
steel
making
process
starts
with
the
processing
of
rocks
that
have
been
extracted
from
a
mine
containing
____________________
.
These
rocks
are
crushed
(
trituradas
)
and
ore
iron
is
extracted
using
magnetic
media
.
This
iron
ore
is
mixed
with
____________________
and
melted
in
a
big
furnace
(
HORNO
DE
FUNDICIÓN
)
.
The
melted
steel
will
be
treated
in
different
ways
to
obtain
ingots
,
sheets
or
bars
.
Often
additives
are
added
to
the
melted
steel
like
chromium
,
____________________
or
titanium
to
obtain
different
alloys
of
the
steel
with
different
____________________
.
