Geography Rivers

When large pieces of load material (stones and sand carried by the river) wear away the riverbed and banks (E.g. Floods)

• Attrition

• Corrosion

• Abrasion

• Hydraulic Action

What is Corrosion

• When chalk and limestone dissolve in water

• rocks being crushed

• Sand fades

• rocks break apart

What is Hydraulic Action?

• When rocks are being transported

• causes floods

• dissolves mud

• Force of water wears away at softer rocks like clay.

What are the 3 main stages of the river valleys.

• Upper

• Middle

• Lower

• Steep

What is Precipitation?

• Clouds turning in water vapour

• When the sun heats up from clouds

• rocks that goes through soil

• Rain, hail, sleet and snow that falls from clouds.

Which way does the waterfall move in?

• ⬅️

• ➡️

How are waterfalls formed

• The water can erode the hard rock. The water can erode the softer rock, under the hard rock. This is called Hydraulic Action. The soft rock on the bottom eventually collapses forming a waterfall.

• The water cannot erode the soft rock. The water can erode the harder rock, under the soft rock. This is called Hydraulic Action. The hard rock on top of a soft rock eventually collapses forming a waterfall.

• The water cannot erode the hard rock. The water can erode the softer rock, under the hard rock. This is called Hydraulic Action. The hard rock on top eventually collapses forming a waterfall.

• The water cannot erode the hard rock. The water can erode the hard rock, under the hard rock. This is called Hydraulic Action. The soft rock on top eventually collapses forming a Hydraulic Action

The source is

• when a stream or smaller river joins a larger one

• The end or start of the river

• The beginning or start of the river

• The beginning or start of the lake

The 4 types of transportation are

• Solution

• Traction

• Suspension

• Saltation

• Hydraulic Action

Meanders can be formed at the _______ of the river.

• Lower Course

• Sea

• Upper Course

• Middle Course