Physiography and Drainage
Maharashtra Board · Class 10 · Geography
Quick revision notes for Physiography and Drainage — Maharashtra Board Class 10 Geography. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
Physiographic Divisions of India
- India is divided into five major physiographic divisions: the Himalayas, the North Indian Plains, the Peninsula, Coastal Plains, and Island groups.
- The Himalayas are young fold mountains and extend from Pamir Knot in Tajikistan to the east. In India, they extend from Jammu and Kashmir to Arunachal Pradesh.
- The Himalayas have many parallel ranges. From south to north, these are Siwaliks, Lesser Himalayas, Greater Himalayas or Himadri, and Trans Himalayan ranges.
Physiography of Brazil
- Brazil has five physiographic divisions: the Highlands, the Coastal region, the Island groups, the Great Escarpment, and the Plains.
- A large part of Brazil is occupied by highlands, plateaus, and small mountains.
- The Brazilian Highlands occupy southern Brazil and are also called Brazilian Shield or Brazilian Plateau.
Drainage of India
- Rivers in India are classified into Himalayan rivers and Peninsular rivers.
- Himalayan rivers are perennial because they are fed by glaciers and also receive rain during monsoons.
- The main Himalayan river systems are the Indus and the Ganga.
Drainage of Brazil
- Brazil has three major river basins: the Amazon Basin, the Paraguay-Parana system in the southwest, and Sao Francisco with other coastal rivers.
- Amazon collects its headwaters from the eastern slopes of the Andes Mountains in Peru.
- Amazon has a huge discharge of about 2 lakh m3/s, or 2,09,000 cu.m/sec.
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