Question

1.2. One of the main reasons for the formation of'l'-shaped valley in the upper course of a river is - a) Gentle slope b) A large number of tributaries c) "Higher rate of vertical erosion ซา Higher rate of lateral erosion​

Answer 1

Answer:

Erosion is the major reason for the formation of I-shaped valley in the upper course of the river. Explanation: The process of corrasion will happen if the rocks fallen into the river.The river cuts a deep notch down into the landscape using hydraulic action, when the sheer force of the water gets into small cracks and breaks down the sides of the river valley. The river transports the rocks downstream and the channel becomes wider and deeper creating a V-shaped valley between interlocking spurs.

Answer 2

High Rate of Vertical erosion is the main reason when it comes to form steep valleys as water flows swiftly in this phase.