The heaviest rocks, which are rolled along the river bed in river tran

The heaviest rocks, which are rolled along the river bed in river transport, come under which type of load?

Solution load
Suspension load
Saltation load
Traction load
This question was previously asked in
UPSC CAPF – 2021
The heaviest rocks rolled along the river bed come under traction load.
Traction load refers to the largest and heaviest sediment particles transported by a river, which are moved by being rolled or dragged along the river bed.
River load transport mechanisms include:
– **Solution load:** Dissolved material carried within the water.
– **Suspension load:** Fine particles like clay and silt held up and carried within the main flow of water.
– **Saltation load:** Medium-sized particles like sand and gravel that move by bouncing or hopping along the bed.
– **Traction load:** Coarsest and heaviest material like pebbles, cobbles, and boulders that are rolled or slid along the river bed by the force of the water.
The description “heaviest rocks, which are rolled along the river bed” directly matches the definition of traction load.