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Methods of Erosion

· Attrition ­ material (load) carried by the river bump into each other resulting into smoother,
smaller particles.

· Abrasion ­ This is the process which the bed and banks of the river are worn down by the
river load.

· Corrosion ­ This is the…

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· Oxbow Lakes ­ erosion causes the outsides of the bends to get closer until there's
only a small bit of land left between the bends, this is called the neck. The river
breaks through the land more than likely during a flood. The river flows along the
shortest course,…

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the river channel. Over time the deposited material builds up, creating levees along
the edges of the channel.

· Deltas ­ Rivers are forced to slow down when they meet the sea, this causes them
to deposit the material, the material builds up and the channel gets blocked, this

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· Confluence - The confluence is the point at which two rivers or streams meet.

· Tributary - A tributary is a smaller stream or river which joins to a bigger stream or

· Source - The start of the river.

· Mouth - The point where the river…

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· A hydrograph shows the following;

-Peak rainfall: Peak rainfall is the highest amount of rain/precipitation that takes place.

- Peak discharge: The highest amount of discharge in the time period you are observing.

- Lag time: The lag time is the delay between peak rainfall and peak discharge.


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- The area of the storage basin: Large basins recieve more precipitation than a smaller basin,
it also takes longer for the water to get to a river or watersource therefore resulting in a
longer lag time.

- The shape of the drainage basin: An elongated basin with flat slopes…

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sinks to the bottom of the riverbed, this in turn raises the rivrbed reducing the volume of
water the river channel can hold in turn increasing the risk of flooding.

· Urbanisation - Many impermeable materials are in an urban area, buildings, roads and paths
are made of materials such…


Mr A Gibson


In terms of the theory and concepts this document has everything you need no matter which exam board you are studying. Print this off and get it in your revision folder. Even better, do a second copy and annotate some examples onto it in the relevant place.



This is really helpful. Thankyou



Is this for the 9-1 exams as well?

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