Meander

• Hydraulic action is when water forces air into rocks, dislodging them.
• Abrasion is when rocks in the water are dragged along the river bed, grinding it down.
• Solution is when salts and acids in the river dissolve minerals in the rock.
• Attrition is when rocks in the water hit off each other and break into smaller pieces.
• Riffles and pools lead to changes in speed and depths in the river channel
• Pools are areas of deeper water whereas riffles are shallower with greater turbulence.
• River flows fastest on the outside bend increasing the erosive power.
• River flows slowest on the inside bend, leading to deposition.
• Helicoidal flow moves materials across the river channel. This leads to river cliffs and beaches developing.
• Meanders migrate downstream as erosion continues.