____________________
:
the
starting
point
of
the
river
Upper
____________________
:
the
initial
stage
of
the
river
in
the
mountains
.
Middle
____________________
:
where
the
river
flows
more
slowly
through
landscapes
that
are
less
steep
.
Lower
____________________
:
the
river
flows
slowly
and
deposits
the
rocks
.
The
____________________
:
the
water
carried
by
the
river
flows
into
another
river
,
a
lake
or
the
sea
.
