Question

➡ True / False :-
1) Maximum sidecutting of a river occurs in the upper course.
2) The cracks of a glacier are called crevasses.
3) Hanging valley is formed due to fluvial erosion.
4)Potholes are formed at the base of waterfalls.
5)Podsol soil is ideal for paddy cultivation.
6) The highest plateau of India is Pamir plateau.
7)Satpura is a block mountain.​

Answer 1

Answer:

1.False

2. True

3.True

4. False

5. True

Answer 2

1) Maximum side-cutting of a river occurs in the upper course - True

• River generally originate from Mountains or High-lands and descend slopes to get to plains and finally joins the Sea. In this journey of the River, It takes many turns and twists because of high and low land-forms.
• Generally, Plains do not have much ups and downs. So, River does not twist much here.
• But, in Mountains or High-lands, Land-form is not flat. So, River bends, turns and twists maximum in its upper course i.e in Mountainous regions or High-lands.

2) The cracks of a glacier are called crevasses - True

• A deep, open crack in a glacier is called a 'crevasse.'
• The top portion of ice or glacier is brittle. When it moves, this top-portion cracks.
• These cracks become deeper as the Glacier moves or with passage of time and become a 'crevasse.'

3) Hanging valley is formed due to fluvial erosion - True

• When the speed of River is more, River carries soil and rocks with it. In course of time, this erosion deepens the River-bed.
• Fluvial Erosion starts when the flow energy of River-water exceeds the resistance of materials like soil or rocks.
• Land above such a River-bed becomes a Hanging-valley.

4) Potholes are formed at the base of waterfalls - True

• 'Pot' means a deep hole.
• Potholes are deep, natural holes or caves formed due to erosion of soil caused by the action of River-water.
• The turbulence generated by the falling water on soil or rocks where it falls gives rise to 'pot-holes.'

5) Podzol soil is ideal for paddy cultivation - False

• Podzol soil is strongly acidic soil that contains aluminium and iron oxides.
• It is generally not fertile and is not suited for cultivation.
• Paddy cultivation is best done in Alluvial soil which is a mixture of silt, clay and loamy soil. Such a soil has good water-holding capacity which is ideal for paddy cultivation.

6) The highest plateau of India is Pamir plateau - False

• Pamir plateau is not in India but in China.
• Highest plateau in India is 'Deccan Plateau' which is also the oldest.
• Highest plateau in the world is 'Tibetan Plateau.'

7) Satpura is a block mountain - True

Satpura and Vindhya ranges come under the category of 'Block Mountains.'

• These mountains have vertical cracks on their body which make them look like as if They are made-up of Giant Blocks of Rock material. So, They are called 'Block Mountains.
• Cracks on Earth's crust force some blocks of rock to assemble up and other rock-blocks assemble below.
• Instead of Earth folding to form mountains, Earth's-crust cracks and arranges in a step like manner that makes its front side to look steep and back-side to look sloping. Such mountains are called 'Block Mountains.'