Test: Landforms And Their Evolution

Erosion transformed surfaces from high to low, irregular to regular and vice- versa.

Seif is similar to barchan with a small difference. Seif has only one wing or point. This happens when there is shift in wind conditions. The lone wings of seifs can grow very long and high.

Natural levees are low, linear and parallel ridges of coarse deposits along the banks of river. Point bars are found on the convex side of meanders of large rivers.

River terraces are basically products of erosion as they result due to vertical erosion by the stream into its own depositional floodplain.

A landform may be a mountain, a valley, a plateau etc.Landforms are the result of geomorphic processes.

In the middle stages, streams cut their beds slower, and lateral erosion of valley sides becomes severe. Gradually, the valley sides are reduced to lower and lower slopes.

Limestone is rich in calcium carbonate, which is easily dissolved in water, through which the chemical process of solution and precipitation deposition develops varieties of landforms.

Valleys start as small and narrow rills. They gradually develop into long and widen gullies. This further deepens, widens and lengthens to give rise to a valley.

Natural levees are found along the river bank as low, linear and parallel ridges are deposited during the flooding of the same river.

Winds cause deflation, abrasion and impact. Deflation includes lifting and removal of dust and smaller particles from the surface of rocks. In the transportation process sand and silt act as effective tools to abrade the land surface. The impact is simply sheer force of momentum, which occurs when sand is blown into or against a rock surface.