geography- rivers

• lower course of river: river flows faster and deeper, more energy is released, more erosion
• middle course of river: a river that has a wide valley and a wide floodplain
• upper course of river: the source of the river where it starts to flow downhill
• types of erosion: abrasion attrition solution and hydralic action
• attrition: small particles rubbing together creating smaller pieces which can be carried away by the current
• abrasion: when rocks are rubbed against each other by moving water
• solution: dissolving rock through chemical reactions with carbon dioxide or oxygen
• hydraulic action: water flowing over an object with great force breaking it apart
• types of transportation: solution suspension traction and saltation
• traction: larger boulders and pebbles being dragged along the bed of the river
• suspension: fine sediment is suspended in the river as it flows downstream
• saltation: large stones hopping across the riverbed
• solution: minerals are disolved in water carried by the river
• river long profile: a profile of a river that shows the change in the river's course over time
• river cross profile: a profile of a river showing the course of the river and the direction of the river flow
• oxbow lake: A lake formed by a meander of a river that has been cut off from its main channel
• meander: (of a river or road) follow a winding course