Presentation on theme: "Lesson 3 – page 3. To learn what is erosion: Abrasion Hydraulic action Attrition Solution To learn what is transportation: Traction Saltation."— Presentation transcript:
Lesson 3 – page 3
To learn what is erosion: Abrasion Hydraulic action Attrition Solution To learn what is transportation: Traction Saltation Suspension Solution To learn what is deposition. Key Skill = Communication
Erosion is the wearing away of land and then the transportation of the worn away material.
Abrasion: When material carried by the river rubs against its banks and bed. Attrition: Rocks transported by the river collide, break up into smaller pieces and become smoother and more rounded. Hydraulic action: The force of moving water. Solution: When chemicals in water dissolves the rock.
What is erosion? What are the 4 processes that make up river erosion?
Is the movement of the material that has been eroded. This material is called the load.
Bedload (along the streambed – sometimes called traction) Saltation (by a series of hopping movements along the bed) Suspended load (above the bed) Solution (dissolved in the water).
What is transportation? What are the 4 processes that make up river transportation?
As the river loses energy it can no longer carry its load. The load settles to the river bed. The larger load settles first.
Explain why deposition happens in rivers.
Try to devise a sketch or sketches to help illustrate the processes of erosion and transportation.