Hydraulic Action - This is the sheer power of the water as it smashes against the river banks. Air becomes trapped in the cracks of the river bank and bed, and causes the rock to break apart., Abrasion - When pebbles grind along the river bank and bed in a sand-papering effect., Attrition - When rocks that the river is carrying knock against each other. They break apart to become smaller and more rounded., Solution - When the water dissolves certain types of rocks, eg limestone, Erosion - The process that wears away the river bed and banks. _______ also breaks up the rocks that are carried by the river., Transportation - the movement of sediment and dissolved materials downstream, Traction - large, heavy pebbles are rolled along the river bed. This is most common near the source of a river, as here the load is larger., Saltation - pebbles are bounced along the river bed, most commonly near the source, Suspension - lighter sediment is suspended (carried) within the water, most commonly near the mouth of the river , Deposition - When the river loses energy, it drops any of the material it has been carrying, Weathering - The breakdown of rock in situ, Chemical Weathering - chemicals in the rain dissolve the rock, Physical Weathering - physical changes causes rocks to break down, for example changes in temperature cause water to freeze and expand, melt and contract, Biological Weathering - occurs when plants and animals wear away rocks, for example, roots growing in cracks in the rock or animals such as rabbits burrowing into rock.,

Rivers Y11

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Rangliste

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Indstillinger

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