Period
from
invention
of
____________________
(
4500BC
)
to
invention
of
____________________
.
Main
activities
were
agriculture
and
____________________
.
The
first
metal
that
discover
was
the
____________________
,
second
the
____________________
and
last
the
____________________
.
That
metal
made
people
____________________
.
Settlements
became
____________________
cities
with
walls
.
There
were
new
rolls
,
____________________
,
____________________
and
metalworkers
.
They
____________________
the
metallurgy
,
the
wheel
,
sails
and
____________________
.
