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The Peninsular Plateau and the Ghats
The Peninsular Plateau as an ancient, stable block of Gondwana with its west-to-east tilt; the Central Highlands north of the Narmada (Aravalli, Malwa, Vindhya, Satpura, Bundelkhand, Baghelkhand and Chota Nagpur) and the Narmada and Tapi rift valleys; the Deccan plateau and its lava Traps; the Meghalaya plateau and Karbi Anglong; the Western and Eastern Ghats with their hills, peaks and passes; and the two Ghats compared.
हिमालय आणि मैदाने पाहिल्यानंतर आता देशातील सर्वात जुनी जमीन, दक्षिणेकडील त्रिकोणातील द्वीपकल्पीय पठार. हा देशाचा भक्कम पाया आहे; बहुतेक भाग 600-900 मीटर उंच, भोवती डोंगररांगा, पश्चिमेला आणि पूर्वेला घाट. हिमालय म्हणजे आता बांधले जाणारे नवे घर, तर पठार म्हणजे कोट्यवधी वर्षे झिजलेली जुनी दगडी पायरी; म्हणून टेकड्या गोलसर, दऱ्या रुंद आणि नद्या संथ. ते कोणत्या बाजूला झुकले आहे हे कळले की नद्या, खनिजे आणि दोन घाटांचा फरक समजतो. (→ English: plateau · हिन्दी: पठार)
हे पठार गोंडवाना नावाच्या जुन्या मोठ्या भूभागाचा तुकडा आहे; एकेकाळी ते आफ्रिका, ऑस्ट्रेलिया यांच्याशी जोडलेले होते. त्याचा पाया ग्रॅनाइट, नाइससारखे खूप जुने अग्निजन्य खडक आणि रूपांतरित खडक. याला घड्या पडल्या नाहीत; कडक फळीसारखे तडे गेले. जुनी सिमेंटची फरशी वाकत नाही, फक्त तडे जातात ना, तसे. तड्यांमधला तुकडा वर उचलला गेला तर गट पर्वत, खाली खचला तर खचदरी. खचलेल्या खड्ड्यांत वनस्पतींचे अवशेष कोळसा झाले; दामोदर खोऱ्यात झरिया, राणीगंज. (→ English: igneous rocks, metamorphic rocks, block mountain, rift valley · हिन्दी: आग्नेय शैल, कायांतरित शैल, भ्रंशोत्थ पर्वत, भ्रंश घाटी)
हे पठार सपाट नाही; पश्चिम बाजू उंच आणि पूर्वेकडे उतरते. ताट एका बाजूने उचलून पाणी ओतले की खाली वाहते तसे, महानदी, गोदावरी, कृष्णा, कावेरी पश्चिमेला उगम पावून पूर्वेला बंगालच्या उपसागराला मिळतात आणि त्रिभुज प्रदेश बनवतात. नर्मदा आणि तापी मात्र पश्चिमेला अरबी समुद्रात; त्या तड्यांमुळे बनलेल्या दऱ्यांतून वाहतात. उत्तरेला जमीन गंगेकडे उतरते; चंबळ, बेतवा, केन, सोन उत्तरेकडे वाहतात. (→ English: plateau tilt · हिन्दी: पठार का झुकाव)
नर्मदेच्या उत्तरेकडचा भाग म्हणजे मध्यवर्ती उच्चभूमी. वायव्य कडेला अरवली, जगातील सर्वात जुन्या घडीच्या पर्वतांपैकी एक; आता झिजून गुजरातकडून दिल्लीकडे तुटक रांगा; सर्वात उंच ठिकाण माउंट अबूवरचे गुरुशिखर. शेजारी माळवा पठार, चंबळने खोल घळया कापल्या. दक्षिण कडेला विंध्य, नर्मदा खोऱ्याकडे तोंड करून उभा कडा, भिंतीसारखा वाळूचा दगड. पूर्वेला बुंदेलखंड, बघेलखंड. (→ English: escarpment · हिन्दी: कगार)
विंध्य आणि सातपुडा यांच्यामध्ये नर्मदा वाहते; ती खचदरीचे उत्तम उदाहरण आहे. अमरकंटकला उगम पावून पश्चिमेला खंभातच्या आखाताकडे जाते. तिच्या दक्षिणेला सातपुडा, तड्यांमध्ये वर उचललेला गट पर्वत; सर्वात उंच ठिकाण पचमढीजवळचे धूपगड. त्याच्या दक्षिणेला तापी दुसऱ्या समांतर दरीतून पश्चिमेला सुरतजवळ समुद्राला मिळते. दोन टेबलांच्या मधल्या फटीतून पाणी सरळ वाहते तसे. क्रम: उत्तरेकडून विंध्य, नर्मदा, सातपुडा, तापी. (→ English: rift valley, block mountain · हिन्दी: भ्रंश घाटी, भ्रंशोत्थ पर्वत)
मध्यवर्ती उच्चभूमीच्या पूर्व टोकाला छोटा नागपूर पठार; बहुतेक झारखंडमध्ये, ओडिशा, छत्तीसगड, बंगालमध्येही. रांची, हजारीबागसारखी छोटी पठारे मिळून बनलेले; ईशान्य कडेला राजमहाल टेकड्या. त्याचे महत्त्व खनिजांमुळे; जुन्या खडकांत लोहखनिज, दामोदर खोऱ्यात झरिया, राणीगंजचा कोळसा. कच्चा माल जिथे तिथेच कारखाना उभारतो तसे, खनिजे जिथे तिथे पोलाद कारखाने वाढले. (→ English: plateau · हिन्दी: पठार)
| Unit | Where | Key point |
|---|---|---|
| Aravalli | Gujarat to near Delhi | Very old, worn-down fold mountains; Guru Shikhar (1,722 m) on Mount Abu |
| Malwa plateau | Western Madhya Pradesh | Largely lava-covered; drained north by the Chambal; ravines |
| Vindhya | North of the Narmada | Sandstone escarpment; continues east as the Kaimur hills |
| Bundelkhand and Baghelkhand | UP-MP border and east of it | Old granite and gneiss uplands |
| Chota Nagpur plateau | Jharkhand and neighbouring states | Mineral belt; Damodar trough with Jharia and Raniganj coal; Rajmahal hills at its edge |
नर्मदा आणि सातपुड्याच्या दक्षिणेला दख्खनचे पठार, एक रुंद त्रिकोण; उत्तरेला सातपुडा, पश्चिमेला पश्चिम घाट, पूर्वेला पूर्व घाट. त्याचा वायव्य भाग दख्खन ट्रॅप; सुमारे 6.6 कोटी वर्षांपूर्वी जमिनीच्या भेगांतून लाव्हा थरावर थर वाहून थंड झाला. घराच्या पायऱ्यांसारखे थर दिसतात; 'ट्रॅप' म्हणजे पायरी. हा खडक झिजून काळी माती होते, कापसाला उत्तम. महाराष्ट्र पठार बहुतेक यावरच; कर्नाटकात मलनाड, मैदान; तेलंगणा जुना ग्रॅनाइट. (→ English: Deccan Traps, lava · हिन्दी: दक्कन ट्रैप, लावा)
द्वीपकल्पाचा एक तुकडा दूर ईशान्येला आहे. मेघालय (शिलाँग) पठार आणि आसाममधल्या कार्बी आंगलाँग टेकड्या त्याच जुन्या खडकाच्या आहेत; पण राजमहाल आणि गारो टेकड्यांमधील फट (माल्दा फट) त्यांना वेगळे करते, नंतर गंगा, ब्रह्मपुत्रेच्या गाळाने ती भरली. एकाच साडीतून कापलेला तुकडा दूर पडला तरी तेच कापड असते तसे. पश्चिमेकडून गारो, खासी, जैंतिया टेकड्या. दक्षिण बाजू मान्सूनच्या वाऱ्यांना थेट अडवते म्हणून मौसिनराम, चेरापुंजीला प्रचंड पाऊस. (→ English: Meghalaya plateau · हिन्दी: मेघालय पठार)
पश्चिम घाट (महाराष्ट्रात सह्याद्री) तापी खोऱ्यापासून कन्याकुमारीजवळपर्यंत सुमारे 1,600 किमी. हा पठाराचा उचललेला पश्चिम किनारा; समुद्राकडून पाहिला तर भिंतीसारखा उभा कडा, दख्खनच्या बाजूने हळूहळू चढ. कोकणातून घाट चढताना उभा चढ आणि वर देशावर सपाटी लागते तसे. मध्ये काही घाटरस्ते: थळ घाट, बोर घाट (मुंबईहून नाशिक, पुणे), पालघाट खिंड. दक्षिणेकडे उंची वाढते; अनैमुडी (2,695 मी.) द्वीपकल्पात सर्वात उंच, दोड्डाबेट्टा निलगिरीत. गोदावरी, कृष्णा, कावेरी येथेच उगम पावतात. (→ English: escarpment · हिन्दी: कगार)
पूर्व घाट वेगळ्या प्रकारचे. ओडिशातील महानदी खोऱ्यापासून आंध्रमार्गे तमिळनाडूपर्यंत, पण एकसंध भिंतीसारखे नाहीत; महानदी, गोदावरी, कृष्णा, कावेरी यांनी त्यांना कापून रुंद फटी केल्या. दात तुटलेल्या फणीसारख्या तुटक रांगा. हे कमी उंचीचे, गोलसर शिखरांचे. ओडिशात महेंद्रगिरी प्रसिद्ध; उत्तर आंध्रातील अरमा कोंडासारखी शिखरे त्याहून उंच. दक्षिणेला नल्लमला, तमिळनाडूत जवादी, शेवरॉय (येरकॉड). शेवटी निलगिरीत पश्चिम घाटाला मिळतात. (→ English: Eastern Ghats · हिन्दी: पूर्वी घाट)
दोन घाटांची तुलना केली की सगळे जुळते. पश्चिम घाट उंच आणि सलग; मान्सूनच्या वाऱ्यांना आडवे उभे राहून पश्चिम उतारावर जोरदार प्रतिरोध पर्जन्य आणि दाट जंगले; मागचे पठार पर्जन्यछायेचा प्रदेश. छत्रीची पुढची बाजू ओली आणि मागची कोरडी राहते तसे. इतरत्र न आढळणारे जीव असल्याने श्रीलंकेसह जैवविविधता हॉटस्पॉट; 2012 मध्ये युनेस्को जागतिक वारसा स्थळ. पूर्व घाट तुटक, कमी उंच आणि कोरडे. पुढच्या भागात किनारे आणि बेटे. (→ English: orographic rainfall, rain-shadow area, biodiversity hotspot · हिन्दी: पर्वतीय वर्षा, वृष्टि छाया क्षेत्र, जैव विविधता हॉटस्पॉट)
| Feature | Western Ghats | Eastern Ghats |
|---|---|---|
| Continuity | Almost continuous; broken by a few passes (Thal, Bhor, Palghat) | Broken into separate hill groups by big rivers |
| Height | Higher; rise towards the south | Lower, rounded summits |
| Highest point | Anamudi (2,695 m), highest in peninsular India | Peaks of northern Andhra Pradesh and Odisha (Arma Konda, Mahendragiri) |
| Rivers | Source of the Godavari, Krishna and Kaveri; short swift west-flowing streams | Cut through by the Mahanadi, Godavari, Krishna and Kaveri |
| Rainfall | Heavy orographic rain on the western slopes | Much drier |
| Biodiversity | Hotspot with Sri Lanka; UNESCO World Heritage Site (2012) | Less rich and less studied |
Exam traps
- The Narmada and the Tapi run WEST along rift valleys to the Arabian Sea and end in estuaries, not deltas; the Mahanadi, Godavari, Krishna and Kaveri flow EAST and form deltas.
- North to south order: Vindhya, Narmada, Satpura, Tapi. The Narmada lies between the Vindhya and the Satpura; the Tapi lies south of the Satpura.
- The Narmada rises at Amarkantak in the Maikal hills; the Satpura is usually described as a block mountain, not a fold mountain.
- Peninsular India's highest point is Anamudi (2,695 m, Anaimalai hills, Kerala); Doddabetta (2,637 m) is the highest in the Nilgiris; Guru Shikhar (1,722 m) is the highest point of the Aravalli.
- Geologically, the Meghalaya plateau and Karbi Anglong are part of the Peninsula, cut off from the main block by the Garo-Rajmahal (Malda) gap; they are not part of the Himalaya.
- The Deccan Traps are basalt lava flows (about 66 million years old) covering the north-western Deccan; Telangana's plateau is mainly granite and gneiss, not lava.
- The Western and Eastern Ghats meet in the Nilgiris. The Eastern Ghats are discontinuous because the east-flowing rivers cut through them.
- Chambal, Betwa, Ken and Son flow NORTH from the plateau to the Yamuna or the Ganga; do not count them as east-flowing peninsular rivers.
Recap
- The Peninsular Plateau is the oldest, most stable part of India, a piece of Gondwana built of ancient igneous and metamorphic rocks.
- It cracked rather than folded: block mountains, rift valleys and Gondwana coal basins such as the Damodar valley.
- Tilted from west to east: most rivers flow to the Bay of Bengal; the Narmada and Tapi flow west through rift valleys; the Chambal, Betwa, Ken and Son flow north.
- Central Highlands: Aravalli (Guru Shikhar), Malwa, Vindhya escarpment, Bundelkhand, Baghelkhand, Chota Nagpur (minerals, Damodar coal).
- Vindhya, Narmada, Satpura (block mountain, Dhupgarh), Tapi, from north to south.
- Deccan plateau: Deccan Traps (basalt, about 66 million years old, black soil); Maharashtra, Karnataka (Malnad and Maidan) and Telangana plateaus.
- Meghalaya plateau and Karbi Anglong: detached parts of the Peninsula; Garo, Khasi, Jaintia hills; very heavy rainfall.
- Western Ghats: continuous, steep, high; Thal, Bhor, Palghat; Anamudi and Doddabetta; heavy rain; hotspot and World Heritage Site. Eastern Ghats: broken, lower, drier; meet the Western Ghats in the Nilgiris.
Practice questions
Q1. Which of the following is the highest peak in peninsular India?
- Doddabetta
- Guru Shikhar
- Anamudi
- Mahendragiri
Show answer
Answer: C. Anamudi
Anamudi (2,695 m), in Kerala's Anaimalai hills, tops the list. Doddabetta (2,637 m) is the highest in the Nilgiris but lower than Anamudi; Guru Shikhar (1,722 m) tops the Aravalli; Mahendragiri is a peak of the much lower Eastern Ghats.
Q2. Consider the following statements:
1. The Narmada flows between the Vindhya and the Satpura ranges.
2. The Tapi flows into the Bay of Bengal after crossing the Deccan.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer
Answer: A. 1 only
Statement 1 is correct. Statement 2 is wrong: the Tapi flows west through a rift valley south of the Satpura and reaches the Arabian Sea near Surat. So '2 only' and 'Both' are wrong, and 'Neither' rejects a true statement.
Q3. Why do the Narmada and the Tapi form estuaries instead of deltas?
- They are fed only by glaciers
- They flow through faulted rift valleys and carry little sediment to the coast
- They flow over the Deccan Traps and dissolve the basalt
- They enter the Bay of Bengal where tides are absent
Show answer
Answer: B. They flow through faulted rift valleys and carry little sediment to the coast
Both rivers run through rift valleys and bring little sediment to the coast, so they end in estuaries. They are peninsular, rain-fed rivers, not glacier-fed; basalt is not dissolved away by rivers; and they enter the Arabian Sea, not the Bay of Bengal.
Q4. Match the following:
A. Thal ghat
B. Palghat gap
C. Guru Shikhar
D. Dhupgarh
1. Highest point of the Satpura
2. Links the Kerala coast with Coimbatore
3. Highest point of the Aravalli
4. Links Mumbai with Nashik
Select the correct code:
- A-4, B-2, C-3, D-1
- A-2, B-4, C-3, D-1
- A-4, B-2, C-1, D-3
- A-1, B-2, C-3, D-4
Show answer
Answer: A. A-4, B-2, C-3, D-1
Thal ghat links Mumbai and Nashik (4), the Palghat gap links Kerala with Coimbatore (2), Guru Shikhar tops the Aravalli (3) and Dhupgarh tops the Satpura (1). The second option swaps the two passes, the third swaps the two peaks, and the fourth matches none of the passes correctly.
Q5. Consider the following statements about the Meghalaya plateau:
1. Geologically it is a part of the Peninsular block.
2. It is separated from the Chota Nagpur region by a gap filled with sediment of the Ganga and the Brahmaputra.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer
Answer: C. Both 1 and 2
Both are correct: the Meghalaya plateau is made of the same ancient rocks as the Peninsula and is cut off from it by the Garo-Rajmahal (Malda) gap, later filled by Ganga-Brahmaputra sediment. '1 only' and '2 only' each leave out a true statement, and 'Neither' rejects both.
Q6. The Deccan Traps are best described as:
- folded sedimentary rocks raised from the Tethys
- layers of basalt lava that erupted through fissures about 66 million years ago
- glacial deposits left on the plateau during an ice age
- coal-bearing Gondwana sandstones of the Damodar valley
Show answer
Answer: B. layers of basalt lava that erupted through fissures about 66 million years ago
The Traps are step-like layers of basalt lava from fissure eruptions about 66 million years ago. Folded Tethys sediments describe the Himalaya, not the Deccan; the Traps are volcanic, not glacial; and the Damodar's coal lies in Gondwana basins, which are a different rock group.
Q7. Consider the following statements:
1. The Eastern Ghats are discontinuous because large east-flowing rivers cut through them.
2. The Eastern and Western Ghats meet in the Nilgiris.
3. The Eastern Ghats receive heavier rainfall on the whole than the Western Ghats.
Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Show answer
Answer: A. 1 and 2 only
Statements 1 and 2 are correct. Statement 3 is wrong: the Western Ghats face the south-west monsoon and get heavy orographic rain, while the Eastern Ghats are much drier. Every other option includes statement 3, so it is wrong.
Q8. Which of the following rivers flows NORTHWARD off the Peninsular Plateau to join the Ganga system?
- Mahanadi
- Godavari
- Tapi
- Son
Show answer
Answer: D. Son
The Son flows north off the plateau to join the Ganga. The Mahanadi and the Godavari flow east to the Bay of Bengal, and the Tapi flows west to the Arabian Sea.
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- Geological Survey of India, Ministry of Mines: the Precambrian shield of peninsular India, the Aravalli, Vindhyan and Gondwana basins, the Narmada-Son lineament, the Deccan Traps and the Shillong plateau — https://www.gsi.gov.in
- Survey of India, Department of Science and Technology: physical map of India and heights of peninsular peaks (Anamudi, Doddabetta, Guru Shikhar) — https://surveyofindia.gov.in
- United States Geological Survey: the Deccan Traps as a large igneous province erupted about 66 million years ago (US government) — https://www.usgs.gov
- Ministry of Environment, Forest and Climate Change: the Western Ghats as a UNESCO World Heritage Site (2012) and part of the Western Ghats and Sri Lanka biodiversity hotspot; Eravikulam National Park and Anamudi — https://moef.gov.in
- India Meteorological Department, Ministry of Earth Sciences: orographic rainfall on the Western Ghats, the rain-shadow of the Deccan, and the heavy rainfall of the Meghalaya plateau — https://mausam.imd.gov.in
- Central Water Commission, Ministry of Jal Shakti: river basin atlas of India, sources and courses of the Narmada, Tapi, Godavari, Krishna, Kaveri, Mahanadi, Chambal and Son — https://cwc.gov.in
- Ministry of Coal and Ministry of Mines: Gondwana coalfields of the Damodar valley (Jharia, Raniganj) and the mineral belt of the Chota Nagpur plateau — https://coal.gov.in