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Year 7 river revision
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Gravity
Terms in this set (21)
Solar radiation
Heat from the sun
It heats up the water
Evaporation
The water Turns into water vapour from solar radiation
Condensation
When the water vapour rises it cools down and it forms clouds
Precipitation
When the clouds are very heavy, water droplets fall, which is rain
Run-off
Some of the precipitation runs down hill it forms lakes and rivers
Through flow
The earth absorbs some of the water and it travels underground by gravity
Confluence
A palace where a tributary joins the main river
Tributary
a smaller river that joins into a larger river
Channel
The bed stream of a river
Watershed
An imaginary line through areas of high land
Drainage basin
An area from all precipitation flows to a single stream
Mouth
Where the river reaches the sea
Source
Where the river begins
Abrasion
Rocks carried along by the river wear down the river bed and banks
Hydraulic action
The force of the of the river against the banks can cause air to be trapped in cracks and crevices. The pressure weakens the banks and gradually wears it away.
Solution
Soluble particles are dissolved into the river.
Attrition
Rocks being carried by the river smash together and break in smaller, smoother and rounder particles
Traction
Pebbles and larger sediments are rolled along the sea bed.
Saltation
Rocks are being bounced around on the river bed by the force of the water.
Suspension
Small particles are carried in the water, which can make the water look muddy.
Solution
Minerals are dissolved in the sea water and carried in solution. The rocks can come from cliffs, made out of chalk or limestone.
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