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S3 Geography - What shapes our earth?: Rivers

Prezi to help with revision of Rivers
by

Mr T Simpson

on 15 January 2015

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Transcript of S3 Geography - What shapes our earth?: Rivers

THE WORK OF A RIVER
REMINDER:

This is a tool to assist
with revision after looking through your jotter and checklist - It is not a replacement for
the above!
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).
Drainage basins
A DRAINAGE BASIN is the total area of land drained by a river and all its tributaries
KEY FEATURES:
The SOURCE. This is where a river begins.
A
The MOUTH. This is where the river meets the sea.
B
The WATERSHED is the area of high land forming the edge of a river basin.
C
CONFLUENCE is the point at which two rivers meet.
D
A TRIBUTARY is a small river or stream that joins a larger river.
E
EROSION
HYDRAULIC ACTION

This process involves the sheer force of the water hitting against the river bed and banks.
ABRASION/CORRASION

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.
CORROSION/SOLUTION

This is the chemical action of river water. The acids in the water slowly dissolve the bed and the banks.
ATTRITION

Material (the load) carried by the river bump into each other and so are smoothed and broken down into smaller particles.
TRANSPORTATION
SOLUTION

Dissolved material is carried along in solution in the water.
SUSPENSION

Very small particles of rock and soil suspended in the river water. They make the water cloudy.
TRACTION

This is when larger particles, like rocks or boulders, are dragged along the river bed.
SALTATION

This is when small pieces of rock bounce along the river bed.
RIVER MODEL
UPPER COURSE
LOWER COURSE
MIDDLE COURSE
V-SHAPED VALLEYS
WATERFALLS
MEANDERS
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
OX-BOW LAKES
RIVERS ON A MAP
Full transcript