This document discusses the different agents of erosion - wind, water, and glaciers - and how each erodes landscapes. Water is identified as the most important agent, acting through chemical, hydraulic, abrasive, and attritive processes to erode river beds. Rivers transport eroded material as dissolved, bed, and suspended loads. Wind erodes through deflation, abrasion, and attrition, especially in arid regions, transporting material as bedded and suspended loads. Glaciers erode through plucking and abrasion, transporting all material embedded within the glacier in an unclassified load.
This presentation class 7 geography , chapter-3 Our changing earth.(Part-1)
in PPT explanation about earth Movement ; Endogenic and exogenic force.
endogenic force ; sudden movement and diastrophic movement
explain about volcano and earthquake.
Wind has the ability to shape the surface of the Earth. Wind is one of the greatest agents of land erosion and transportation. The action of wind is very significant in arid and semi-arid regions. Due to profound wetness, wind cannot act in humid regions. Wind is capable of eroding, transporting and depositing the surface materials, in drylands. The landforms created by wind action are called as Aeolian landforms. The word “Aeolian” is derived from the Greek word “Aeolus”, meaning, the god of the winds.
This presentation class 7 geography , chapter-3 Our changing earth.(Part-1)
in PPT explanation about earth Movement ; Endogenic and exogenic force.
endogenic force ; sudden movement and diastrophic movement
explain about volcano and earthquake.
Wind has the ability to shape the surface of the Earth. Wind is one of the greatest agents of land erosion and transportation. The action of wind is very significant in arid and semi-arid regions. Due to profound wetness, wind cannot act in humid regions. Wind is capable of eroding, transporting and depositing the surface materials, in drylands. The landforms created by wind action are called as Aeolian landforms. The word “Aeolian” is derived from the Greek word “Aeolus”, meaning, the god of the winds.
In these slides you will learn briefly about difference about weathering and erosion, different types of erosion and cycle of erosion, transport agents and landforms what are its influences on topography and types of Landforms..
TRUE OR FALSE: The Earth’s surface has stayed the same for thousands of years
FALSE: the Earth’s surface is always changing
EXAMPLE
EROSION & DEPOSITION
EROSION
Is the process by which natural forces move weathered rock and soil from one place to another.
Sediment – material moved by erosion .
DEPOSITION
Occurs where the agents of erosion lay down sediment.
Mass Movement
Any one of several processes that move sediment downhill.
Different types of Mass Movement
Landslide
- occurs when rock and soil slide quickly down a steep slope.
Different types of Mass Movement
Mudflow
- mudflow is a rapid downhill movement of a mixture of water, rock, and soil.
Different types of Mass Movement
Slump
- a mass of rock and soil suddenly slips down a slope.
Different types of Mass Movement
Creep
- very slow downhill movement of rock and soil.
Water Erosion
Rills and Gullies
Rills
- tiny grooves in the soil.
Gully
- a large groove , or channel, in the soil that carries runoff after a rainstorm
Streams and Rivers
Stream
- a channel along which water is continually flowing down a slope.
River
- a large stream
Amount of Runoff
In an area depends on five main factors:
1st – amount of rain
2nd – vegetation
3rd – type of soil
4th – shape of the land
5th – how people use the land
Erosion by River
Through erosion, a river creates a waterfalls, flood plains, meanders, and oxbow lakes.
Waterfall
May occur where a river meets an area of rock that is very hard and erodes slowly.
Flood plain
Flat, wide area of land along a river.
Meander
A loop like bend in the course of the river
Oxbow lake
A meander that has been cut off from the river.
Deposits by River
Deposition creates landforms such as alluvial fans and deltas. It can also add soil to a river’s flood plain.
Alluvial Fans
A wide, sloping deposit of sediment formed where a stream leaves a mountain range.
Deltas
Sediment deposited where a river flows into an ocean or lake.
Groundwater Erosion
Groundwater can cause erosion through a process of chemical weathering.
Stalactite – hangs down from the roof of a cave.
Stalagmite – pointed piece of rock that sticks u p from the floor.
How Water Erode and Carries Sediment
Most sediment washes or falls into the river as a result of mass movement and runoff. Other sediment erodes from the bottom or sides of the river.
Abrasion- is the wearing away of rock by grinding action.
- occurs when particles of sediment in flowing water bumped into the steam again and again.
Erosion and Sediment Load
A river’s slope, volume of flow, and the shape of its trembled all affect how fast the river flows and how much sediment it can erode.
Slope
Is the amount the river drops toward sea level over a give distance.
Volume of Flow
A river’s flow is the volume of water that moves past a point on the river on a given time.
Streambed Shape
Affects the
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
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A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
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1. 1 | P a g e E r o s i o n
Ali Bux Wassan Department of Mining Engineering MUET,Jamshoro
EROSION
Definition:
“It is the transportation of weathered material” OR
“EROSION is the break up and removal of rock by moving natural agents like wind, water and
glacier”.
Agents of Erosion/Erosional Agents:
Erosion is caused mainly by three agents:
1) Wind (Blowing Air)
2) Water (Running Water)
3) Glacier(Moving ice)
Out of these three, the 1st
agent i.e. water is the most important and it is responsible for the
maximum havoc .Moreover, it is considered to be the most powerful agent, especially in times
of flood.
It may act in three forms:
1. Falling Rain drops
2. Running Rivers and Streams
3. Running Overland Flow
A. Erosion by Running Water (River):
River erode their bed by several processes, thus rate of erosion depended upon:
1) Velocity of River
2) Nature of bed rock
3) Sediments’ load
Thus river does erosion in 4 ways:
I. Chemical Action: (water is Universal Solvent)
It includes the solvent and chemical action of water on country rocks e.g. It has been
observed that whenever water containing CO2 comes in contact with Limestone ,it gets
dissolved into the water easily.
II. Hydraulic Action:
Rapid flowing water hammers the uneven faces of rocks exposed along its channel and
rock fragments.
2. 2 | P a g e E r o s i o n
Ali Bux Wassan Department of Mining Engineering MUET,Jamshoro
III. Abrasion: The flowing water uses the pebble, gravels etc as a tool for scratching and
breaking the sides and floor of the channel.
IV. Attrition:
It is the breaking of the transported material due to mutual collusion; as a result the rock
particles became more rounded and smaller in size.
Transportation by River:
A river carries enormous amount of soil and rock material, this sedimental material flowing in a
river is called its “LOAD”,
This can be classified into three types:
1) DISSOLVED LOAD: is the water soluble material
2) BED LOAD: is that heavier material which moves along the bed of the river with occasional
jumps
3) SUSPENDED LOAD: consists of finer material, which is kept in suspension by the turbulence
of flowing water e.g. clay particle
The deposit formed by running water is called ALLUVIAL deposit.
B. Erosion by Wind:
The air in motion is called “Wind”. It is an important Erosional agent; its work is
particularly seen in arid region. It is quite an effective agent of erosion in deserts and
dry areas.
Wind erosion is generally caused by three main processes:
1) Deflation:
It is process of simply removing the loose sand and dust from an area by fast
moving winds. Deflation is the very effective process of wind erosion at places where the
land is dry as in deserts.
2) Abrasion:
The blowing winds generally pick up sand particles from the earth’s surface and
then move as sand laden wind, when this wind strikes the rocks or other structures in their
way, they will cause them to erode by the rubbing and grinding action of the moving sand
particles.
3) Attrition:
The particles that travel with wind collide against one another .These mutual
collisions lead to their further break down and the process is called attrition.
3. 3 | P a g e E r o s i o n
Ali Bux Wassan Department of Mining Engineering MUET,Jamshoro
Transportation by Sediments by Wind:
The total sediments load carried by wind can be divided into:
I. Bedded Load:
The larger and heavy particles such as sands and gravel constitute the
bed load. These particles move in a series of rolls and jumps along the bed.
II. Suspended Load:
The finer clay or dust particles, which are lifted by the moving
winds by s distance of hundred of meters above the earth, is called suspended load.
C. Erosion by Glacier:
A glacier is a “mass of moving ice”. This causes erosion of the
surfaces over which it moves. OR
Glaciers are the rivers of ice which moves over the ground under the influence of gravity.
All the rock material carried by a Glacier is called “MORAINE”.
About 10% of our present world is covered by glacier.
The y are slow erosive agents as compared to water and wind
The work of Erosion, by GLACIERS is done in following ways:
a) Plucking:
Particles ranging in size from fine powder to giant boulders are picked up by the
glacier from its valley floor through which it moves, and carries them along.
b) Abrasion:
The moving ice grinds, scratches and polishes the rock with help of rock
fragments which are held firmly within the body of a glacier.
Transportation by Glaciers
The material carried by glacier ,is transported entirely in an embedded state in its body.
The size of such material ranges from the finest clay to boulders of many tons. The loose
rock materials deposited by the ice are called “Glacial Deposits”