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As the rocks collide together they get smaller, so then the smaller ones are deposited further downstream, this is known as attrition.

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Q: The average sediment size decreases downstream?
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How would size of the sediment in the streams load differ in the streams volume increasing or decreasing?

The size of the sediment would decrease further downstream (where there is a greater volume of water) as there is more energy in the flow. Therefore more erosion will occur and the sediment will rub together with other materials i.e other rocks or the river bed (this is called attrition). The sediment will therefore reduce in size but there will be a greater amount of it. (The amount of sediment is called the discharge.)


What does silt and sediment mean?

Silt refers to a sediment of a certain size. Sediment can be of any size particle which has been deposited.


Why does load particle size decrease downstream?

Load particle size decreases downstream due to the transport capacity of the river being higher further downstream, allowing larger particles to settle out and be deposited. Smaller particles are able to remain in suspension and be carried further downstream before settling. Additionally, erosion and weathering of larger particles can lead to their breakdown into smaller particles over time.


How is permeability related to the size of the grains that make up the sediment?

If the size of the sediment is very small then it would have poor permeability But if the size of the sediment was large then it would be easier for liquids to flow through.


Why does a stream discharge increase?

In the upper course of a river, there is a V-shaped valley with a steep gradient as the water is constantly using up the majority of its energy to overcome friction. As a river flows downstream, the valley becomes a U-shape and the gradient decreases. This is because there is less gravitational pull towards the sea/lake level. Also towards the middle and lower courses, there are more tributaries and confluences which will add more discharge to the river basin. This is constantly happening and thus, as it flows downstream it increases. The velocity also increases as there is more discharge.


What are three ways strata differ from one another?

The differ based on the kind of sediment that they are composed of, the color of their sediment, and the size of their sediment.


Why does bed load decrease in size?

The bedload becomes smaller when the river is flowing downstream, and the rocks also become smaller, smoother and rounder due to attrition and abrasion. (The reason the flow slows down is because the energy of the flow decreases.)


Are all the particles of sediment the same size?

no


What happens to the size of the sediment a stream normally carries when it flows from a mountainous area to a flatter area?

The sediment size carried by the stream increases. EW


What decreases across the periodic table?

Atomic size decreases across a period


What happensto the size of ice when it frezes from water?

Its size decreases.


What is the smallest size of sediment particle called?

dust