Source
:
the
starting
point
of
river
.
Upper
source
:
the
initial
____________________
of
the
____________________
in
the
mountaints
.
The
water
flows
____________________
and
drags
rocks
with
it
.
Middle
course
:
where
the
____________________
flows
more
____________________
trought
____________________
that
are
less
____________________
,
forming
a
____________________
plain
.
The
mouth
:
at
the
final
stage
the
water
____________________
by
the
river
,
____________________
ot
the
sediments
are
____________________
.
Lower
course
:
in
this
final
____________________
the
river
flows
____________________
and
____________________
the
rocks
that
it
has
____________________
along
with
it
and
from
____________________
called
meander
s
