Over time cliffs retreat Landforms by erosion to a combination of sub-aerial weathering and coastal erosion. The gradient of highly meandering streams ranges between 20 cm to 10 m per kilometre.
Wind erosion requires strong winds, particularly during times of drought when vegetation is sparse and soil is dry and so is more erodible. All streams meander in all types of terrains e. River terraces are also divided Landforms by erosion Any perceptible down-slope movement of rock or sediment is often referred to in general terms as a landslide.
A wave-cut notch is formed by erosional processes such as abrasion and hydraulic action - this is a dent in the cliff usually at the level of high tide. The wastage of the sea coastor coastal erosion, is brought about mainly by the action of sea waves but also, in part, by the disintegration or degradation of sea cliffs by atmospheric agents such as rainfrostand tidal scour.
However, erosion can also affect tectonic processes. Where the coasts has the same type of rock along its length fewer bays and headlands are formed as the rate of erosion tends to be similar. It has been estimated that Niagra falls have receded upto about 11 km till now.
A wave-cut platform is a wide gently-sloping surface found at the foot of a cliff. One of the visible topographical manifestations of a very slow form of such activity is a scree slope.
When the upcurrent amount of sediment is greater, sand or gravel banks will tend to form as a result of deposition. Another process that occurs is corrasion, where sediment and rocks in the sea water are hurled against the cliff face. Where the cave erodes through the headland an arch is formed see image below.
In some cases, the eventual end result is desertification. Erosion makes the coastline varied and interesting, and often give the coastline its "wow" factor.
November Mountain ranges are known to take many millions of years to erode to the degree they effectively cease to exist. The image below shows cracks in the chalk cliffs at Flamborough, Holderness Coast. Bays are more sheltered with constructive waves which deposit sediment to form a beach.
Wave cut platforms have a significant impact on the ability of waves to erode the base of the cliff. The net result of this over long periods of time is that the hard rock is left jutting out to sea as a headland, and the softer rock is eroded into curved sand filled bays.
Erosion landforms Landforms produced by erosion and weathering usually occur in coastal or fluvial environments, and many also appear under those headings.
Arête. A few different processes cause landforms to develop, and this has shaped some impressive natural features on the surface of the Earth. These processes include erosion, where the action of glaciers, wind and water erode surface deposits at varying rates.
The significant landforms resulting from fluvial erosion by streams include river valleys, waterfalls, pot holes, structural benches, river terraces, river meanders, ox-bow lakes and peneplians etc.
Erosional Landform # 1. River Valleys: The valleys carved out by the rivers are significant erosional landforms. A few different processes cause landforms to develop, and this has shaped some impressive natural features on the surface of the Earth.
These processes include erosion, where the action of glaciers, wind and water erode surface deposits at varying rates. Landforms of erosion. There is a range of landforms of erosion found along the coast. These are determined by geology, rates of erosion and beach profile.
For each landform you need to understand how processes of weathering (freeze thaw, hydration, biological, salt crystallisation), mass movement (slumping, slides, rock falls) and erosion (Hydraulic Action, Corrasion, Corrosion) contributes to the formation.Landforms by erosion