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S3 Geography - What shapes our earth?: Rivers
Transcript of S3 Geography - What shapes our earth?: Rivers
This is a tool to assist
with revision after looking through your jotter and checklist - It is not a replacement for
The Water Cycle
The water cycle is a system where water moves
from the sea, to the air by EVAPORATION, it the cools
and CONDENSES to form clouds, falls to the land as PRECIPITATION and back to the sea again by way of the world’s rivers (SURFACE RUN-OFF).
A DRAINAGE BASIN is the total area of land drained by a river and all its tributaries
The SOURCE. This is where a river begins.
The MOUTH. This is where the river meets the sea.
The WATERSHED is the area of high land forming the edge of a river basin.
CONFLUENCE is the point at which two rivers meet.
A TRIBUTARY is a small river or stream that joins a larger river.
This process involves the sheer force of the water hitting against the river bed and banks.
This is the process by which the bed and banks are worn down by the river’s load. The river throws these particles against the bed and banks.
This is the chemical action of river water. The acids in the water slowly dissolve the bed and the banks.
Material (the load) carried by the river bump into each other and so are smoothed and broken down into smaller particles.
Dissolved material is carried along in solution in the water.
Very small particles of rock and soil suspended in the river water. They make the water cloudy.
This is when larger particles, like rocks or boulders, are dragged along the river bed.
This is when small pieces of rock bounce along the river bed.
As the river slows, it starts to move sideways, forming bends in the river called MEANDERS.
The river is slow and shallow on the INSIDE of the bend, meaning it DEPOSITS material forming a RIVER BEACH
The river is fast and deep on the OUTSIDE of the bend, so it ERODES the bank forming a RIVER CLIFF
RIVERS ON A MAP