Part 3: Geomorphology 60. This is a cross section of a glacial moraine. It\'s sh
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Question
Part 3: Geomorphology 60. This is a cross section of a glacial moraine. It's shape will change through time. Explain the many geomorphological processes that are most likely responsible for the changes in its cross sectional shape through time. 61·The Ganges Delta in the Bay of Bengal (just east of India) consists in large part of rocks that originally formed the high peaks of the Himalayas (the headwater of Ganges). Explain briefly how the solid bedrock ends up as silt in the ocean floor. Make sure to cover all the pertinent steps in the continuum. 62. Discuss how groundwater affects land-sliding potential. 63. Explain the various flow paths that water can take on a soil mantled hillslope on its way downslope.Explanation / Answer
60. It is an example of ridge like pattern formed along the margin of glacieated valley by deposition. From the very beginning the ridge would have started to form by lateral deposition from both sides, deposition overtime would have resulted in this type of cross section. Now from here on the the debris may somewhat solidify get compacted, but will undergo continuous erosion process. The debris on top may get eroded under the effect of gravity, the debris on the sides will undergo lateral cutting, and this debris will move forward and may get deposited elsewhere.
61. All the sediments that end up in ocean either have their origin in the mountains or in the pathways.
The mountain rocks, undergo physical and chemical weathering. The water running through rocks, may get into the fractures, joints, and weaken the rock chemically, and running action and gravity break and carry the rock fragments froward. The rock fragments that are broken may be large or small, they move in the direction of running water. During transport they keep on undergoing reduction in size while in traction saltation and suspension. Some of the silt size sediments get deposited along the banks of rivers where the velocity of river is slow, those which are not deposited move on and get depossited in the oceans.
62. first, if the water hosting the rocks is calcitic or dolomitic, it will form cavern i.e. underground cavity. These cavities will cause the overlying rock to subside or slide in hilly region thus resulting in landslide.
the other way in hilly region the water that leaches down to the groundwater, weakens the rock through fractures and joints. over time along the slope this weakened rock layer slides down.
63. The water at the slopes may seep downward or run along the surface forming various pathways, cutting downslope and softer ways through the slope.