Which of the following statements is correct regarding Loess?
A. The surface covered by deposits of wind transported silt that has settled out from dust storms over many thousands of years, such material is known as loess.
B. Loess is long, narrow ridges of sand that lie parallel to the direction of the prevailing winds.
C. Loess is an isolated heap of free sand.
D. Loess dunes are common in the western part of the Thar Desert of India.
Answer:A
Which of the following statements is correct regarding Loess?
A. The surface covered by deposits of wind transported silt that has settled out from dust storms over many thousands of years, such material is known as loess. B. Loess is long, narrow ridges of sand that lie parallel to the direction of the prevailing winds. C. Loess is an isolated heap of free sand. D. Loess dunes are common in the western part of the Thar Desert of India.
Explanation: In several large areas of the world, the surface is covered by deposits of wind transported silt that has settled out from dust storms over many thousands of years. This material is known as loess. Loess tends to break away along vertical cliffs whenever it is exposed by the cutting of a stream or grading of a roadway. It is also very easily eroded by running water and is subject to rapid gullying when the vegetation cover that protects it is broken. The thickest deposits of loess are in northeast china, where a layer over 30m deep is common and a maximum thickness of 100m has been measured.