Question Q.13Give a reasoned accountGS1GS1
Give a reasoned account of the distribution of deserts across the earth with the help of relevant examples.
Introduction
Desert is an area that receives rainfall less than 25cm per year. This gives rise to arid & semi-arid stones in desert.
22 words
Main Body
[Diagram: World map showing distribution of deserts - Mohave, Sahara, Atacama, Patagonia, Kalahari, Gobi, Australian desert]
Fig: Deserts across the earth
Reasons for distribution of deserts
1Cold Ocean Current - causes desiccating effect on east shores on tropical areas
2Peru current causing - Atacama desert
2Sub-tropical high pressure belt prevents cloud formation & rains. eg Sahara desert in Africa.
3Outward trade winds from land to sea have low moisture and no rain. eg Mohave - California
4Rain-shadow effect on interiors. eg Patagonia is in rain-shadow zone of Andes.
[Diagram: Rain shadow effect showing wet windward side and dry leeward side]
Fig: Rain shadow
5Continentality → lesser rain bearing winds & extreme temperature in interiors. eg Gobi desert.
6Cold deserts: caused due to severe temperature in Tundra & Taiga zones eg Siberian desert.
Anthropogenic factors for desertification
1Mining activities causing land degradation eg Jharkhand, CG.
2Faulty agricultural practices causing soil degradation eg Punjab, Haryana.
3Deforestation for development projects. eg Uttarakhand, Kerala, etc.
4Shifting agriculture eg Jhums in Assam.
5Forest fires due to global warming eg California fires, Amazon fires.
— Poorva Agrawal · AIR 65
190 words8 paragraphs
Conclusion
Thus, it's said that the geographical boundaries of deserts are expanding due to human actions. This calls for UNCCD - the toolbox for controlling desertification.
25 words
Diagram
World map showing locations of major deserts - Mohave, Sahara, Atacama, Patagonia, Kalahari, Gobi, Australian desert
- Good use of diagram
- Reasoned scientific explanation
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Topper
Poorva Agrawal
AIR 652024
Subject & Paper
GS1GS1
Topic
World Physical Geography
Distribution of Deserts
Climatic factors for desert formation
Writing Stats
237
Total words
8
Paragraphs