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Rivers

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by

Lucy MacKenzie

on 16 February 2013

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Transcript of Rivers

RIVER PROCESSES Transport Traction Saltation Suspension Solution Erosion Hydraulic Action Abrasion Attrition Solution Deposition A river transports the debris (it's load). -larger particles roll along the river bed.
-boulders and pebbles. -large particles are lifted and dropped back down as they are carried by the river.
-gravel and sand. -fine particles are transported along the river without any contact with the river bed.
-clay, silt and fine sand. -dissolved materials (that cannot be seen by the naked eye) are carried in the water.
-calcium and sodium. RIVERS LONG PROFILE -where the river dumps some of it's load.
-the larger material is deposited first.
-occurs where the water is slower or shallower. RIVERS Erosion is where a surface of earth is worn away by the action of water, glaciers, winds, waves, etc.
-Near to the source of a river, there is a lot of downward erosion. -erodes the earth by the force of the water hitting the river bed and banks.
-most effective where there is lots of water and the water is moving
fast. -when the load that the river is carrying constantly hits the river bed and banks, causing pieces to break off. -when the stones and boulders the river is carrying knock against each other repeatedly - over time weakening, pieces starting to fall off. -when the water dissolves certain rocks like chalk and limestone, because they are soluble in water. A river's long profile shows it's course from it's source to it's mouth. Source Mouth -the source of a river is where the river starts.
-it is often an upland area. -a river mouth is where the river flows into an ocean, sea, estuary, lake or reservoir. -at the mouth of a river, a delta can form. Springs -some rivers start where a natural spring releases water from the ground. Rainfall and Melting Snow -in mountains or hills, rainwater or snowmelt collects and can form small channels that become the source of a river. Lakes -lakes are also the source of some rivers. Bogs -if the ground is too wet, rain water cannot sink into it and the result is a bog.
-water can flow out of a bog and form a lake or a stream.
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