Distinguish between the different types of erosion that take place within a river channel.

In a river channel, erosion is the process that wears away the river bed and banks. If you were to look at the sides and bottom of a river channel beneath the water, we would not see smooth and even surfaces, but rather jagged and rough surfaces. Erosion also breaks up the rocks that are entrained or carried in river flow. Much like when you throw a twig into the river and it is carried by the water, rocks and debris are also transported within the flow.The four main types are:Hydraulic Action is where the water breaks us the river banks as it smashes against the rock during fast flow. Due to this, air is forced into the cracks in the bed and causes the rocks to break apart.Abrasion is where small rocks and pebbles grind along the river bank and become smooth, much like if you rubbed sandpaper on a jagged rock.Attrition is when rocks that are carried by the river knock against each other and break down to become smaller and smoother.Solution is where the river water naturally dissolves certain types of rocks like limestone.I will demonstrate each of these processes with a simple diagram.