अपवाह (Drainage) NCERT भूगोल कक्षा 9 अध्याय 3 – विस्तृत सारांश परिचय अपवाह (Drainage) का अर्थ किसी क्षेत्र की नदी व्यवस्था से है। एक मुख्य नदी और उसकी सहायक नदियाँ मिलकर नदी तंत्र बनाती हैं। भारत की नदियाँ कृषि, सिंचाई, जलविद्युत, परिवहन और मानव जीवन के लिए बहुत महत्वपूर्ण हैं। भारत की नदी प्रणाली को मुख्य रूप से दो भागों में बाँटा गया है: हिमालयी नदी प्रणाली प्रायद्वीपीय नदी प्रणाली 1. हिमालयी नदी प्रणाली मुख्य हिमालयी नदियाँ: सिंधु गंगा ब्रह्मपुत्र विशेषताएँ ये सदानीरा नदियाँ हैं (साल भर बहती हैं) इनका जल स्रोत हिमनद और वर्षा दोनों हैं लंबी और गहरी नदियाँ बड़े मैदान और डेल्टा बनाती हैं A. सिंधु नदी प्रणाली Indus River का उद्गम तिब्बत में मानसरोवर झील के पास से होता है। मुख्य विशेषताएँ यह भारत, तिब्बत और पाकिस्तान से होकर बहती है कुल लंबाई लगभग 2900 किमी इसकी प्रमुख सहायक नदियाँ: झेलम चिनाब रावी ब्यास सतलुज महत्व सिंचाई के लिए अत्यंत महत्वपूर्ण पंजाब क्षेत्र की कृषि का आधार B. गंगा नदी प्रणाली Ganga भारत की सबसे महत्वपूर्ण नदी मानी जाती है। उद्गम गंगोत्री हिमनद (उत्तराखंड) से नि...
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Physical Features of India – One Liner Facts for Exam

NCERT Geography Class 9 Chapter 2







Important One-Liner Facts

  1. India has six major physiographic divisions.

  2. The Himalayas are the youngest fold mountains in the world.

  3. The Himalayas were formed due to the collision of the Indian Plate and Eurasian Plate.

  4. Himadri is the highest Himalayan range.

  5. Himadri is also called the Greater Himalaya.

  6. The average height of Himadri is about 6000 metres.

  7. Himachal is also known as the Lesser Himalaya.

  8. Shiwaliks are the southernmost range of the Himalayas.

  9. Valleys between Shiwaliks are called Duns.

  10. Dehradun is a famous Dun valley.

  11. Purvachal hills lie in the northeastern part of India.

  12. Patkai, Naga, and Mizo Hills are part of Purvachal.

  13. The Northern Plains are formed by alluvial deposits.

  14. Indus, Ganga, and Brahmaputra rivers form the Northern Plains.

  15. Northern Plains are densely populated.

  16. Khadar is the new alluvial soil.

  17. Bhangar is the old alluvial soil.

  18. Terai is a marshy and wet region.

  19. The Peninsular Plateau is the oldest landmass of India.

  20. The Peninsular Plateau is made of igneous and metamorphic rocks.

  21. The Central Highlands lie north of the Narmada River.

  22. The Deccan Plateau lies south of the Narmada River.

  23. Chotanagpur Plateau is rich in minerals.

  24. Western Ghats are higher than Eastern Ghats.

  25. Western Ghats receive heavy rainfall.

  26. Eastern Ghats are discontinuous hills.

  27. The Indian Desert is also called the Thar Desert.

  28. Thar Desert lies mainly in Rajasthan.

  29. Luni is the main river of the Indian Desert.

  30. Western Coastal Plains are narrow.

  31. Eastern Coastal Plains are wider than Western Coastal Plains.

  32. Konkan Coast lies between Mumbai and Goa.

  33. Malabar Coast lies along Kerala.

  34. Coromandel Coast lies along Tamil Nadu.

  35. Lakshadweep Islands are coral islands.

  36. Andaman and Nicobar Islands lie in the Bay of Bengal.

  37. Barren Island is India’s only active volcano.

  38. India’s physical features influence climate and agriculture.

  39. Northern Plains are ideal for farming.

  40. Coastal Plains are important for fishing and trade.

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