1. Uplift of a mountain range is likely to result in (circle best answer): (a) s
ID: 298544 • Letter: 1
Question
1. Uplift of a mountain range is likely to result in (circle best answer): (a) submergence of the mountain tops beneath the sea; (b) deposition in and filling in of mountain stream valleys with sediments; (c) decrease in erosion rates in stream canyons; (d) steepening of streams in the mountain range and deepening of their canyons;
2. Which of the following do NOT influence a stream's power to cut a canyon (circle best answer): (a) sediment load carried by stream; (b) amount of water in the stream; (c) erodibility of the rocks in the stream bed: (d) amount of uranium dissolved in the stream; (e) steepness of the streambed.
3. The flow speed of groundwater compared to surface water is generally (circle best answer): (a) depends on the part of the river; (b) faster, (c ) the same: (d) slower (e) cannot be compared without
additional information.
4. The ................ of a rock or soil is a measure of the void space within the material and the ................. of rock or soil is a measure of how readily water can flow through the material.
Explanation / Answer
1. answer d:Uplift of a mountain range takes place due to tectonic process or due to isostatic upliftment of mountains due to removal of overlying sediments. This uplifting of mountains make them prone to weathering and erosion. The result of this upliftment results in the formations of steeping of stream valleys and deepening of canyons in the mountain range.
2. answer d:The ability of a stream to cut a canyon depends upon various factors like how much water is in the stream. Higher the discharge greater is its ability to erode. Also greater the sediment load in the stream lower will be its capacity to erode and also depends on the steepness of the stream. Steeper the stream gradient higher will be its capacity to erode. It does not depend on the amount of uranium dissolved in the stream.
3. answer d:The speed of the ground water is much slower than the speed of surface water. The ground water is laminar whereas most of the surface water are turbulent eg. river water, mud flows etc. Since the ground water is a laminar flow it follows the Darcy's law and cannot be applied to surface water.
4. The porosity of a rock is a measure of the void space in the soil or the rock and is the ability of a fluid to hold water whereas the permeability is the ability to transmit the water. Porosity of clay is very high but it is not permeable whereas limestone are very permeable.
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