Types of transportation

• Traction


  Large, heavy pebbles are rolled along the river bed. This is most common near the source of a river, as here the load is larger.

  
• Saltation


  Pebbles are bounced along the river bed, most commonly near the source.

  
• Suspension


  Lighter sediment is suspended within the water, most commonly near the mouth of the river.

  
• Solution


  The transport of dissolved chemicals. this varies along the river depending on the presence of soluble rocks.