Erosion, deposition
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Erosion is the process by which wind, water, ice or gravity transports soil and sediment from one location to another. There are several types of erosion: - Wave erosion occurs when waves crash against the shore and form features like sea stacks, sea arches, and sea caves by eroding away rock and mainland over time. - Wind erosion removes and transports soil, sand, and rock particles through processes like abrasion and deposition of materials like loess and in the formation of sand dunes. - Glacial erosion carves rugged landscapes and features like cirques and alpine valleys through the scraping and grinding action of glaciers moving over the land.
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Lesson 5: Weathering and erosion
Constructive waves build up the coastline by carrying sediment to shore and depositing it, while destructive waves erode the coastline by removing sediment. Physical processes like weathering, erosion, transportation and deposition are constantly changing the coastline. Erosion wears away rock and sediment by abrasion, attrition and hydraulic action, while weathering breaks rocks through corrosion and wetting/drying. The rate of erosion depends on factors like the rock type, shape of the coastline, and distance waves have traveled.
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TRUE OR FALSE: The Earth’s surface has stayed the same for thousands of years
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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.
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Landslide
- occurs when rock and soil slide quickly down a steep slope.
Different types of Mass Movement
Mudflow
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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
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The document discusses coastal landforms created by erosion. Softer rocks erode more quickly than harder rocks, creating bays where soft rocks were. Harder rocks remain as headlands exposed to erosion, which cracks and enlarges them over time, eventually forming caves. As caves erode further they can form arches that eventually collapse, leaving stacks and stumps.
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12 s070502 e_erosion and deposition ppt
Erosion is the process by which rock material is detached and transported from one location to another by forces like wind, water, ice or gravity. There are several types of erosion including wind erosion, water erosion, wave erosion, gravitational erosion and glacial erosion. Deposition occurs when the transported material can no longer be carried by the force and settles in a new location. Deposition happens through processes like decreasing wind speed, slowing water flow or melting ice. Erosion and deposition work together to continuously change the landscape over time as material is worn down and rebuilt in other areas.
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The document discusses various agents of erosion. It describes how water, in the form of surface water and groundwater, is the most powerful erosion agent and can create landforms like deltas and caves. Ice is also noted as a powerful erosion force, with moving glaciers carving valleys. Wind erosion predominantly impacts arid regions, changing rock shapes. Waves in coastal areas continuously erode old landforms and build new ones through marine processes. The document also notes that human activities now represent a significant force of erosion through construction, mining, and other land alterations.
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The document discusses various coastal landforms created by erosion and deposition processes along shorelines. It describes landforms such as headlands and bays, cliffs and wave-cut platforms, caves, arches, stacks, and stumps which are formed by coastal erosion. Beaches and spits are landforms created by coastal deposition, with beaches forming in sheltered areas between high and low tide lines, and spits forming as narrow ridges projecting from the coast due to longshore drift depositing materials.
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Erosion
This document discusses various processes of erosion and deposition. It describes five main agents that cause erosion: gravity, glaciers, wind, running water, and ocean waves. Each agent breaks down and transports material, then deposits sediments in new locations to form landforms like moraines, drumlins, deltas, and beaches. Gravity causes rapid mass movement or slow creeping. Glaciers carry debris and leave piles of debris called moraines. Wind erodes loose material from deserts and fields, depositing loess and dunes. Running water is a major cause, forming canyons and depositing material in river deltas and flood plains. Ocean waves erode shorelines, depositing beaches, spits, and barrier
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Weathering, Erosion, and Deposition
Weathering breaks rocks down into smaller pieces through physical or chemical processes when exposed to the atmosphere and hydrosphere. Physical weathering breaks rocks without changing their chemical composition through processes like frost wedging and abrasion. Chemical weathering alters the chemical composition of rocks through oxidation, hydrolysis, and carbonation. The products of weathering accumulate as soil and are further eroded by agents such as water, wind, and ice. Erosion transports eroded material which is eventually deposited elsewhere, usually in bodies of water, based on factors like particle size, shape, density, and transport velocity.
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TRUE OR FALSE: The Earth’s surface has stayed the same for thousands of years
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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.
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Landslide
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Different types of Mass Movement
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Different types of Mass Movement
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- a mass of rock and soil suddenly slips down a slope.
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- very slow downhill movement of rock and soil.
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- tiny grooves in the soil.
Gully
- a large groove , or channel, in the soil that carries runoff after a rainstorm
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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
Coastal Landforms
The document discusses coastal landforms created by erosion. Softer rocks erode more quickly than harder rocks, creating bays where soft rocks were. Harder rocks remain as headlands exposed to erosion, which cracks and enlarges them over time, eventually forming caves. As caves erode further they can form arches that eventually collapse, leaving stacks and stumps.
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The document summarizes various marine erosion processes that form coastal landforms. It describes hydraulic action, corrasion, attrition, and corrosion as processes that slowly wear away cliff rock. These processes can form features like wave-cut notches, platforms, caves, arches, stacks, and stumps. The document also explains how alternating resistant and soft rock layers along coastlines can form headlands and bays through differential erosion.
Erosion
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12 s070502 e_erosion and deposition ppt
Erosion is the process by which rock material is detached and transported from one location to another by forces like wind, water, ice or gravity. There are several types of erosion including wind erosion, water erosion, wave erosion, gravitational erosion and glacial erosion. Deposition occurs when the transported material can no longer be carried by the force and settles in a new location. Deposition happens through processes like decreasing wind speed, slowing water flow or melting ice. Erosion and deposition work together to continuously change the landscape over time as material is worn down and rebuilt in other areas.
Agents of Erosion
The document discusses various agents of erosion. It describes how water, in the form of surface water and groundwater, is the most powerful erosion agent and can create landforms like deltas and caves. Ice is also noted as a powerful erosion force, with moving glaciers carving valleys. Wind erosion predominantly impacts arid regions, changing rock shapes. Waves in coastal areas continuously erode old landforms and build new ones through marine processes. The document also notes that human activities now represent a significant force of erosion through construction, mining, and other land alterations.
Coastal Landforms
The document discusses various coastal landforms created by erosion and deposition processes along shorelines. It describes landforms such as headlands and bays, cliffs and wave-cut platforms, caves, arches, stacks, and stumps which are formed by coastal erosion. Beaches and spits are landforms created by coastal deposition, with beaches forming in sheltered areas between high and low tide lines, and spits forming as narrow ridges projecting from the coast due to longshore drift depositing materials.
EROSION & DEPOSITION (teach)
Erosion and deposition are closely related processes where erosion involves the movement of rocks and sediment from one location to another under the forces of water, wind, or ice. Deposition then occurs when these agents carrying sediment slow down and drop their loads in a new location. Water is the primary agent of erosion, carrying sediment downstream as it erodes rocks and soil from higher elevations. As water velocity decreases, such as at the mouth of a river, its sediment load is deposited, potentially forming features like deltas or beaches over time. Wind is also an erosive force, picking up and transporting sediment which is later deposited in locations like sand dunes when winds calm.
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This document discusses various processes of erosion and deposition. It describes five main agents that cause erosion: gravity, glaciers, wind, running water, and ocean waves. Each agent breaks down and transports material, then deposits sediments in new locations to form landforms like moraines, drumlins, deltas, and beaches. Gravity causes rapid mass movement or slow creeping. Glaciers carry debris and leave piles of debris called moraines. Wind erodes loose material from deserts and fields, depositing loess and dunes. Running water is a major cause, forming canyons and depositing material in river deltas and flood plains. Ocean waves erode shorelines, depositing beaches, spits, and barrier
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The document discusses various landforms and weathering processes, including frost heaves caused by the expansion of freezing water, oxidation shown by changes in soil color due to chemical weathering, and how streams form through erosion on the sides and deposition in the middle. It also describes rock outcrops, runoff from hills to ponds, the phases of the moon and its effect on tides, U-shaped valleys formed by glacial erosion, and cumulus clouds associated with thunderstorms.
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Coastal Processes Good
Waves are generally larger in the southwest of the British Isles than the southeast due to larger fetch, or the distance over which wind can blow over open water to generate waves. Waves break when the wavelength reaches the sea floor, causing the bottom of the wave to slow down while the top continues forward. Coastal erosion processes include abrasion by materials carried in waves, hydraulic action as waves enter cracks and cause small explosions, and corrosion as acids in sea water dissolve rocks. These processes form landforms like headlands and bays, cliffs and wave-cut platforms, and over more time, caves, arches, stacks, and stumps.
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Weathering, Erosion, Deposition, Landscapes
This document discusses weathering, erosion, and deposition processes that shape the Earth's surface. It explains that weathering breaks down rock through physical or chemical means. Erosion then transports weathered material, which is eventually deposited elsewhere. The main agents of erosion are water, wind, ice, and gravity. Glaciers in particular played a major role in shaping landscapes like those in New York State. The document also examines how climate, rock type, and other geologic factors influence landscape development over time.
Erosion and Landforms
This lesson will examine the process of coastal erosion and how it shapes coastlines. Students will learn the four processes of coastal erosion: hydraulic action, abrasion, attrition, and corrosion. They will describe each process and explain how different landforms like headlands, bays, caves, arches, stacks, and stumps result from erosion based on the type of underlying rock geology.
3. landforms created by erosion
This document discusses various landforms created by coastal erosion over thousands of years, including headlands and bays, cliffs and wave-cut platforms, and caves, arches, stacks, and stumps. It provides learning objectives to describe and explain the formation of these landforms through geological processes and the influence of vegetation. Diagrams and videos are referenced to illustrate each landform and the erosion process involved in its development.
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5 Coastal Erosion
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Sec 3 Coastal Management
Hard engineering approaches involve physical structures like seawalls and breakwaters to protect against coastal erosion. Soft engineering focuses on planning and behavior changes, encouraging minimal interference and using natural protections like beach nourishment, relocating properties, and planting mangroves. While hard structures provide effective short-term protection, they require high maintenance and can cause erosion in unprotected areas. Soft approaches are often more sustainable and environmentally friendly solutions.
Coastal erosional processes and landforms lesson 4
The document discusses coastal erosion processes and landforms. It describes the four main erosion processes as corrosion, abrasion, solution, and hydraulic action (CASH). These processes break down and transport sediment, forming features like sea cliffs, caves, arches, stacks, and stumps. Waves erode the base of cliffs and headlands through processes like hydraulic action, creating wave-cut notches and platforms that eventually result in arches and isolated rock columns. Alternating hard and soft rock layers produce headlands and bays along discordant coastlines.
Coastal processes
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This document discusses various coastal landforms and processes. It begins with defining terms related to waves and wave action. It then explains processes of marine erosion and how they can shape cliff coastlines and form wave-cut platforms. It describes how waves can transport and deposit sediment. Landforms like spits, bars, and salt marshes are discussed along with their formation. Finally, it covers coral reef types and theories about their formation, and how sea level changes can impact coral reefs.
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Coastal erosional processes and landforms lesson 4
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Erosion, deposition
- 1. Erosion The process by which wind, water, ice or gravity transports (takes) soil and sediment from one location (place) to another.
- 2. Wave Erosion This happens when waves crash against the shore. Following are some pictures and descriptions of wave erosion.
- 3. Sea Stacks were once connected to the mainland. Waves have ERODED the mainland leaving behind columns of rock, standing all alone.
- 4. Sea Arches form when wave action continues to erode a sea cave, cutting completely through the rock.
- 5. Sea caves form when waves cut large holes into weak rock along a sea cliff.
- 6. Wave Deposition What is “Wave Deposition” you ask? Well… Waves carry a lot of stuff, including sand, rock pieces, dead coral and shells. A lot of times, this material is “deposited,” or left, on a shoreline, where it forms a beach. Following are some examples of what waves have “deposited” on the shore. (“Wave deposition”)
- 7. Beaches are made of different types of material deposited by waves.
- 8. Other types of water erosion… A river caused this beautiful valley in Hawaii to form.
- 9. The Grand Canyon…ever been there? The Grand Canyon was formed by moving water.
- 10. Wind Erosion Have you ever been working outside and had a gusty wind blow a stack of papers all over the place? If this has happened to you, then you have seen how wind erosion works. Wind removes soil, sand, and rock particles and transports them from one place to another.
- 11. Wind Erosion the grinding and wearing away of rock when blowing pieces of sand and rock rub against another rock surface.
- 12. Wind Deposition Ok, now that you know what wave deposition is, I bet you can guess what “wind deposition” is right?.....So…..what is it?
- 13. Loess feels like baby powder! Loess forms when wind carries material far away from it’s source.
- 14. Sand dunes form when a mound of wind-deposited sand keeps moving and keeping it’s shape at the same time, even though it moves.
- 15. Ice or Glacial Erosion Glaciers smooth the land by scraping and eroding parts of the land that were there before the ice appeared. Glaciers also carve out rugged features in the mountain rock through which they flow. Following are some example pictures.
- 16. Alpine Valley Glaciers carved out this rugged landscape in Switzerland.
- 17. By the way… Mrs. Ambrosio took this photo of that same valley in Switzerland (from the other direction, obviously) from a cable car.
- 18. Cirques are examples of glacial erosion because glaciers cut into the back of the mountain.
- 19. Glacial Deposition So…tell me…what is glacial deposition?
- 20. Glacial Drift happens when rock material is carried and deposited (there’s that word again) by glaciers.
- 21. Not all changes in the earth are due to slow processes like EROSION. Some changes are due to rapid processes, like landslides, volcanic eruptions and earthquakes! Following are some picture examples.
- 22. Landslides happen when rock and soil suddenly move down a slope.
- 23. Mudflows happen when mud or rock and soil mixed with a large amount of soil flow down a slope or hill.
- 24. Volcanic Eruptions Mt. St. Helens erupted on May 1, 1981. It definitely changed the land in the area. Before…
- 25. After… How do you think the eruption of Mt. St. Helens affected the surrounding land?