Please enable JavaScript.
Coggle requires JavaScript to display documents.
River Processes (Transport in River Systems (Traction - When large…
River Processes
-
Types of Erosion
Abrasion - When material that the river is carrying is thrown against the river bed and banks. Particles of the rock continuously break off and continue to move downstream.
Hydraulic Action - This is the pressure of the water being pushed against the river banks. As the water splashes against the riverbanks, it compresses the air within cracks in rocks. This can consequently causes pieces of rock to break off.
Solution - This is a chemical reaction between certain rock types and the minerals in the river water. (Particularly evident in limestone areas)
Attrition - (Involves wearing away of rocks that are in the river.) Rocks in the river roll around; as they do so, they grind away at each other.
Keywords
-
Erosion (Within River Processes) - The wearing away of sand / rock / soil along the river bed. It also involves the breaking down of rock particles being carried downstream
Weathering (Within River Processes) - Breakdown of rocks by physical or chemical changes in situ (one place)
Types of Weathering
Physical / Mechanical - Freeze-Thaw is when water gets into cracks; the temperature falls below freezing, the water will expand as it turns into ice, breaking off fragments
Chemical - Rainwater contains weak acids that can react with certain rock types (The carbonates within Limestone)
Biological - This is the action of plants and animals on the land. E.g. Seeds that fall into cracks will grow and break up rock.
-