Source
:
the
____________________
point
of
the
river
.
Upper
course
:
the
____________________
stage
of
the
river
in
the
mountains
.
The
wáter
flows
____________________
and
drags
____________________
with
it
.
Middle
course
:
where
the
river
flows
more
____________________
through
landscapes
that
are
____________________
steep
,
forming
a
flood
____________________
.
Lower
course
:
in
this
____________________
stage
the
river
____________________
____________________
and
____________________
the
rocks
that
it
has
____________________
with
____________________
and
forms
____________________
called
meanders
.
