River Crossword

The area the river comes from
A stream coming of the river
the splitting of the river
The boundary where if it rains it goes into the river
The area where the river enters the sea
The area inside the boundary of the rain going into a river
Large rocks a rolled along the bottom of the river what is this called?
When rocks become smoother
Where acid in the rived dissolves rock
Where material is dissolved in the river and carried along
Where the river loses it's energy and drops it's load