geomorphology & earth landforms section 4 MCQ Questions & Answers Detailed Explanation

Answer: (a)

When the glaciers melt, the tributary troughs are left as hanging valleys high on the walls of the main glacial valley. A hanging valley is a tributary valley with the floor at a higher relief than the main channel into which it flows.

They are most commonly associated with U-shaped valleys when a tributary glacier flows into a glacier of larger volume.

Answer: (b)

Hydraulic action is one of the main forms of river erosion (example of erosion due to running water) in which the force of the river against the banks can cause air to be trapped in cracks and crevices.

The pressure weakens the banks and gradually wears it away.

Answer: (d)

Lateral or sideways erosion widens the river valley; while, Vertical or downward erosion deepens the river valley. Due to continued lateral erosion, the river valley increasingly becomes broader and shallower.

The valley slopes are also eroded by weathering and mass wasting and by the development of tributary valleys.

Answer: (d)

Answer: (c)

Playa is the landform associated with wind in desert areas.

Answer: (a)

The process, by which loose sediment is hardened to rock are collectively called Lithification. Once this happens, continued erosion and re-transport of the sediment become much more difficult.

The process, which involves in it are compaction, recrystallisation, cementation. The sediment may be compacted by the rearrangement of grains under pressure, reducing pore space and driving out the interstitial liquid.