the force of water smashing into the river banks, causes rocks to break away.
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what is a river cross profile?
a diagram showing what the river looks straight through the middle.
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characteristics of the lower course of a river?
gentle gradient, almost flat valley, very wide, deep channel.
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what is a long river profile?
a diagram of the steepness of a river course.
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what is the erosion abrasion?
when eroded material erodes the river bed by scraping along the floor.
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at what part of a river is vertical erosion dominant? why?
at the upper course there is lots of turbulence causing material to scrape along the floor, causing vertical erosion.
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characteristics of the middle course of a river?
medium gradient, u shaped, gentle sloping valley sides, wider, deeper channel.
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what is the method of transportation, traction?
big rocks roll along the bottom of the river bed waring it away with the force of the water.
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what is the erosion attrition?
when small rocks in the water hit against each other causing them to break apart.
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what is the method of transportation, saltation?
the process of small pebbles being bounced along the river bed by the force of the water.
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how is a waterfall formed?
an area of hard rock followed by soft, means soft rock gets eroded first causing a step witha plunge pool underneath. this continues, until the hard rock is undercut, causing an overhang and it collapses.
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characteristics of the upper course of a river?
steep gradient, v shaped valley, narrow, shallow channel.
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what is the method of transportation, suspension?
small material is carried along in the current of the river.
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what is the erosion solution?
when soluble material is extracted from the river banks/bed by the water, dissolving materials such as chalk and limestone.
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reasons for deposition...? (5 reasons)
river looses velocity, amount of river material increases, reaches the mouth, amount of water falls, water is shallower.
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what is the method of transportation, solution?
dissolved material from river banks and bed is held in the current of the river.
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how is a gorge formed?
a waterfall gradually moves backwards with time and in its path it leaves a clip with a sudden fall, this is called a gorge. left in the path of a waterfall.
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Other cards in this set
Card 2
Front
what is a river cross profile?
Back
a diagram showing what the river looks straight through the middle.
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