The
Classic
era
of
Mayan
____________________
came
to
an
end
around
900
AD
.
Why
this
happened
is
unclear
;
the
cities
____________________
probably
over
-
farming
the
land
,
so
that
a
____________________
of
drought
led
to
famine
.
Recent
geological
____________________
supports
this
,
as
there
appears
to
have
been
a
200
-
year
drought
around
____________________
time
.
