The agents of erosion or deposition responsible for the creation of delta,naturallevee,sanddune,floodplain,loess,seacave,sandbar,ushapedvalley,moraine,beach
Answers
Major Landforms
River basin
Sea Arch
Sand Dunes
We have studied in the previous chapter that the earth is a dynamic place i.e., it constantly undergoes changes. The landscape is continuously being worn away by two processes:
Weathering: It is the breaking up of rocks on the earth’s surface. It creates rock fragments.
Erosion: As mentioned earlier, it is the wearing away of landscape by different agents like wind, water and ice. The eroded material is carried away or transported by water, wind, etc. and eventually deposited.
Different landforms are created on the earth’s surface because of erosion and deposition.
A delta is a land form comprised of sediments found at the mouth of the river. A delta can only form when river channels carry sediments into another body of water. Herodotus, a Greek historian, first used the term "delta" for the Nile River in Egypt. This is because the sediment land mass developed at mouth of this river formed a triangular shape that looks like the upper case Greek letter delta.
Factors
The river’s depth, width and velocity determine how much and how big the sediments it can carry. A fast and turbulent river transports larger sediments in size and amount. When the river’s flow slows down, the size of the particles decreases because larger particles are deposited first. This cycle continues producing beds with alternating layers of fine and course sediments. The battle between the river’s flow and the amount of sediments it carries, and the strength of the tidal waves of the body of water, determines the delta’s shape.