Sometimes after ice melting or when there is a lot of rain we can see this agent. Althoug water doesn't run throug it all the time.

These are rivers of ice that erode the ground from the botton to the sides. They make 'U' shaped valleys.

These are permanent water courses. Their most significant action on relief is the formation of fluvial valleys. They constantly erode, transport and form sediments from the earth.

In high coasts, the waves against the rocks form vertical cliffs. The materials are torn away and deposited on beaches.

This is the part of the river that flows from the river source through the mountains.

This is the part of the river with more moderate slopes so the current is less intense. The river is wider and frequently makes meanders.

This is the part of the river where it flows through plains close to the estuary of a river. The current is weak.

The Magdalena River passes by the town of Gamarra in Colombia. In this place the river is wide with a still strong current. What part of the river is it and wich is the dominant action there?

The Magdalena River meets the atlantic ocean in the city of Barranquilla in Colombia. There it makes a beautiful estuary. What part of the river is it and wich is the dominant action there?