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Rivers. According to the United States Geological Survey there are over 3 million rivers around the world and 1500 river systems in the UK alone. How are rivers formed? Rivers are formed when water flows downhill due to gravity, driven by rainfall, melting snow, or underground springs.
- River Processes
Hydraulic action [1] Power of water wears away bed and banks...
- Drainage Basin
Channel network. Every drainage basin is covered by a...
- River Landforms
V-shaped valleys Vertical erosion is dominant in the upper...
- River Processes
Questions and model answers on Rivers for the Cambridge (CIE) IGCSE Geography syllabus, written by the Geography experts at Save My Exams.
River channels are affected by different erosion processes. Match each of the statements to the correct erosion process. Erosion process. Statement. 1 Hydraulic action. A occurs when some types of rock are dissolved in the river. 2 Abrasion.
Flooding is usually the result of heavy or prolonged rainfall. The key factor is the time taken for the precipitation to reach the river from where it falls - the lag time. The shorter the lag time, the higher the risk of flooding because the discharge of the river increases faster.
types of drainage basin. * those that collect and deliver water directly to the sea. * those that are parts of much larger drainage basins, e.g. River Negro (Brazil) is a tributary for the huge drainage basin of the Amazon river. * some drainage basins do not lead (either directly or indirectly) to the open sea.
The force of the river against the banks can cause air to be trapped in cracks and crevices. The pressure weakens the banks and gradually wears it away. Study with Quizlet and memorize flashcards containing terms like Abrasion, Afforestation, Alluvium and more.
tributaries - smaller rivers which join too the main one. confluence - where a tributary meets a main river. mouth/estuary : where river meets sea. Study with Quizlet and memorise flashcards containing terms like 1.1 Hydrological Cycle, Stores, Transfers and others.
