2. Deformation of rocks that takes place desp within the Earth\'s erust is best

Question

2. Deformation of rocks that takes place desp within the Earth's erust is best desceribed (o) Compressional. The weight of the overlying rocks generates predominantly thrust faults (b) Elas tic. When stresses cease, all strain is recovered and rocks return to their original shape. o-plastic. Rocks tend to continually deform but do not do not fail. elastic. Beyond yield stress, small cracks coalesce to form a failure surface satining pressures and high temperatures make the rocks harder which (e) Ductil (e) Brittle. High confining 43. Which of the following does not classify as a soft approach' to floodplain management? (a) Removal of flood embankments (b) Afforestation of river catchments (c) Improved farming practices in the river catchment. (d) Designated flooding areas. (e) Re-routing of the river channel 44. The tower of Pisa is leaning as a result of what? e tower up. (b) Consolidation of a peat layer in the subsurface. (c) Groundwater extraction that takes place on a large scale in Tuscany. (d) Differential settling of its foundation on a mixture of clay, sand and shells in the subsurface (e) Liquefaction of sands due to seismic tremors in the area.

Explanation / Answer

Ans

42.(c) Ductile plastic

Explanation i- We all know that rocks near the surface of the Earth behave in a brittle manner. Crustal rocks are composed of minerals like quartz and feldspar which have high strength, particularly at low pressure and temperature. As we go deeper in the Earth the strength of these rocks initially increases.
At a depth of about 15 km we reach a point called the brittle-ductile transition zone. Below this point rock strength decreases because fractures become closed and the temperature is higher, making the rocks behave in a ductile manner.

43. (a) Improved forming practices in the river catchmant area.

Explanation- Because of its not act to control flooding.

44. (d)

Explanation- Tower of Pisa
consists of three distinct Layer, about 10 m thick, composed of soft sandy and clayey, silt deposits laid down in shallow water (lagoonal, fluvial and estuarine conditions) less than 10,000 years ago.

40. (d) 27 time greter

Explanation- Clay minerals are characterized by high specific surface area (SSA) High specific surface area is associated with high soil-water-contaminant interaction, which indicates high reactivity. The reactivity increases in the order Kaolinite< Illite< Montmorillonite.

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