list out the landforms formed due to river work
Answers
1) V-shaped valleys -
V-shaped valleys are found in the upper course of river and are a result of both erosion by the river and weathering. They are found in the upper course because this is where the river has the greatest gravitational potential energy.
2) Waterfalls -
Waterfalls develop when a change of lithology (rock type) take place along the course of the river resulting in different erosion. When the rock type of the river's channel changes from a resistant rock to a less resistant rock (like granite to limestone), the river erodes the less resistant rock faster producing a sudden drop in the gradient of the river with resistant rock being higher up than the less resistant rock. As the river flows over the resistant rock, it falls onto the less resistant rock, eroding it and creating a greater height difference between the two rock type, producing the waterfall.
3) Rapids -
Rapids are sections of a river where the gradient of the river bed is relatively steep resulting in an increase in the river's turbulence and velocity. They form where the gradient of the river is steep and the bed is composed mainly of hard rocks.
4) Meanders -
Meanders are bends in a river that form as a river's sinuosity increases. The sinuosity of a river is a measurement of how much a river varies from a straight line.
5) Oxbow lakes -
Oxbow lakes are an evolution of meanders that undergo extensive deposition and erosion.
6) Braided channel -
A braided channel is type of channel that is divided into smaller sub-channels
by small, temporary islands. Braided channel develop in the river with a lot of sedimentary load.
7) Floodplains -
Floodplains are large, flat expanses of land that form on either side of a river. The floodplain is the area that a river floods onto when it's experience high discharge.
8) Levees -
Levees are the natural embankments produced, ironically when a river floods.
9 Deltas -
Deltas are depositional land forms found at the mouth of the river, where the river meets a body of water with a lower velocity than the river.
Answer:
V shaped valley
Waterfall
Meander
Delta