Tuesday 10 September 2019 How do geomorphic processes shape the land Starter Practice exam question Geomorphic Processes What does the term geomorphic processes mean A geomorphic process ID: 935443
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Slide1
Slide2Focus Task
What do the images show processes of?
Tuesday, 10 September 2019
How do geomorphic processes shape the land?
Slide3Starter
Practice exam question.
Slide4Geomorphic Processes
What does the term
‘geomorphic processes’
mean?
A
geomorphic process is something that changes the shape of the land.Examples include: erosion, weathering, mass movement, deposition and transportation.
Slide5Geomorphic Processes
Match up the key words to their correct meaning.
Key Word
Meaning
Mass movement
The
break up of rocks by weather.
Weathering
The wearing
away and removing of material by a moving force.
Erosion
Sudden movement of material down a slope caused
by gravity.
Deposition
The
movement of eroded material by the river or sea.
Transportation
The laying down of material
that has been moved.
Slide6Geomorphic Processes
Match up the key words to their correct meaning.
Key Word
Meaning
Mass movement
The
break up of rocks by weather.
Weathering
The wearing
away and removing of material by a moving force.
Erosion
Sudden movement of material down a slope caused
by gravity.
Deposition
The
movement of eroded material by the river or sea.
Transportation
The laying down of material
that has been moved.
Slide7Mass Movement
Mass movement
is the movement of material (rock) down a slope due to gravity.
There are two different types: sliding and slumping.
Type of mass movement
How it works
Sliding
Rock or
loss material slide downhill, often due to heavy rain.
Slumping
Collapse
of weak rock, such as sand and clay. Again this is due to heavy rainfall.
Slide8Weathering
There are three types of weathering: biological, chemical and mechanical.
Create a table like the one shown, and describe how each type of weathering works.
Type of weathering
How it works
Biological
Chemical
Mechanical
Slide9Weathering
There are
three
types of weathering: biological, chemical and mechanical. Create a table like the one shown, and describe how each type of weathering works.
Type of weathering
How it works
Biological
The
actions of plants (roots) and animals (burrowing) crack rocks.
Chemical
Acid
water (CO2) breaks down/dissolves rocks in a chemical reaction.
Mechanical
The breakdown
of rocks without using chemicals. Wind, frost and snow can help.
Slide10Erosion
Erosion
is the wearing away and removal of material (rock and sand) by a moving force (water).
How do you think each type of erosion works?
Type of
erosionHow it works
Hydraulic Action
A
brasion
A
ttrition
S
olution
Slide11Erosion
Erosion
is the wearing away and removal of material (rock and sand) by a moving force (water).
Type of
erosion
How it works
Hydraulic ActionPressure of water hitting a surface, forcing air into cracks
which breaks away rocks.
A
brasion
Rocks scrape and smooth the sea/river bed and cliffs/banks.
A
ttrition
A
reduction in the size of rocks.
S
olution
Rock is dissolved in a chemical
reaction by water.
Slide12Slide13Deposition
Deposition
is when material being transported (moved) is dropped due to a loss of energy.
This can lead to the creation of beaches, like the one shown at Roker in Sunderland.
Slide14Transportation
Transportation
is when material is transported (moved) from one place to
another.There are
four different types of transportation.How do you think the four types of transportation work?
Slide15Transportation
Type of
erosion
How it works
T
raction
Large particles
(boulders/rocks) roll along the seabed.Saltation
A bouncing
motion of pebbles along the seabed.
S
uspension
Particles suspended (float)
in the water.
S
olution
Chemicals dissolved in water and are
moved.
Slide16Steps to Success
Examine the impact of geomorphic processes on river landscapes.
Step
What to include
1:
Opening sentence
Geomorphic processes such as ………
impact river landscapes.
2:
Erosion
Explain how at least two types of
erosion work and what landforms they can create.
3:
Mass
Movement
Explain how mass
movement (sliding and slumping) work.
4:
Transportation
Explain how at
least two types of transportation work, and the impact this has.
5.
Judgement-
do geomorphic processes impact river landscapes?
Geomorphic
processes
do/do not
impact river landscapes. This is because…
Slide17Resources
Slide18Key Word
Meaning
Mass movement
The
break up of rocks by weather.
WeatheringThe wearing away and removing of material by a moving force.
Erosion
Sudden movement of material down a slope caused by gravity.
Deposition
The
movement of eroded material by the river or sea.
Transportation
The laying down of material
that has been moved.
Key Word
Meaning
Mass movement
The
break up of rocks by weather.
Weathering
The wearing
away and removing of material by a moving force.
Erosion
Sudden movement of material down a slope caused
by gravity.
Deposition
The
movement of eroded material by the river or sea.
Transportation
The laying down of material
that has been moved.
Key Word
Meaning
Mass movement
The
break up of rocks by weather.
Weathering
The wearing
away and removing of material by a moving force.
Erosion
Sudden movement of material down a slope caused
by gravity.
Deposition
The
movement of eroded material by the river or sea.
Transportation
The laying down of material
that has been moved.
Key Word
Meaning
Mass movement
The
break up of rocks by weather.
Weathering
The wearing
away and removing of material by a moving force.
Erosion
Sudden movement of material down a slope caused
by gravity.
Deposition
The
movement of eroded material by the river or sea.
Transportation
The laying down of material
that has been moved.
Slide19Slide20Abrasion:
Small rocks carried by the river are hurled at the cliffs causing them to be worn away.
Sliding
Heavy rain soaks into permeable rocks, lubricating them causing material to
suddenly move down a slope due to the pull of gravity.
Deposition
:When a
river slows down
it
has less energy and velocity, this causes sediment to be deposited.
Mechanical- Wind:
High winds remove
finer sediment which can then be blown into the
river causing more abrasion.
Chemical:
Acid
rain reacts with minerals which breaks them down and makes it easy for them to be washed away. Minerals are also weakened when they are exposed to the air in a process called oxidation.
Attrition
:
Small rocks carried by the river are hurled at the cliffs causing them to be worn away.
Saltation:
Stones
and small pebbles are bounced along the river bed, due to the flow of the river.
Traction
:
Large
rocks and boulders are rolled along the river bed.
Suspension:
Very light
material is carried along the river, this sediment is very fine and can make the river look dirty.
Solution:
Rocks such as limestone are broken down into soluble materials by the chemicals in the river water.
Solution
:
Some
sediments are dissolved and carried along by the river.
Mechanical
- Frost:
Waters gets into cracks and freezes, causes it to expand, this puts pressure on the rocks and causes the rocks to break up.
Biological-
Plants and Animals
:
Burrowing
animals such as rabbits and voles
and tree roots loosen
and break up rocks which allows the river water to penetrate them
.
Hydraulic
action:
The power of moving water which is forced against cliffs causing them to be worn away.
Slumping
Clay becomes waterlogged and
slumps down into the river suddenly due to the pull of gravity.
Key
Weathering
Erosion
Mass
Movement
Transportation
Deposition