A ____________ is the place where a river rises.

The main types of river sources are:

When rain falls or snow melts, some of the water flows over the surface of the land and forms ______________.

Tiny streams join up to form __________ .

The rivers flow downhill until they reach ____________.

Any material that lets liquids and gases pass through it.

Any material that does not let

liquids and gases pass through it.

If the layer of impermeable rock comes to the surface of the ground, the water runs out of the ground as a _________.

Wider V-shaped valley formed because river flows less rapidly and erodes both downwards and side wards. Some deposition also takes place.

Narrow deep V-shaped valley formed as river flows swiftly, eroding downwards.

Flat and broad valley formed because river moves slowly forming big bends on the land surface. A lot of deposition takes place.

Near its source, a river is usually high above sea level and it flows very _________ downhill.

Because it flows very fast, the water in a mountain river can push large ________ along

Erosion causes the river to slowly form a _________ valley.