Major Landforms of the Earth
Overview
Earth's surface is not a toy — it has mountains, plains, and plateaus (elevated flatlands). These landforms have been created over millions of years by rivers, glaciers, wind, and oceans — some are broken down (erosion) and some are built up (deposition).
Typed Notes
Mountains — High Homes
Mountains rise very high above the land — their tops are covered with snow. There are three types: (1) Fold mountains — when two of Earth's plates press against each other, the land bends (like folds in cloth) — Himalayas (Asia), Alps (Europe), Andes (the world's longest, in South America). (2) Block mountains — pieces of land break apart and shift up or down. (3) Volcanic mountains — formed when lava erupts from inside the Earth — Kilimanjaro (Africa), Fujiyama (Japan). Benefits of mountains: birthplace of rivers (snow melts to form rivers), forests, wildlife, tourism (Darjeeling, Shimla), and tea/coffee plantations.
Plateaus — Tableland
A plateau is elevated land whose top surface is flat — that is why it is called a 'tableland' (land like a table). It is lower than a mountain but higher than a plain. The Deccan Plateau is India's largest plateau; the Tibet Plateau is called the 'roof of the world'. Plateaus are rich in minerals — that is why a lot of mining takes place here. The East African Plateau and the Malwa Plateau are also well known.
Plains — The Most Fertile Land
Plains are open, flat lands — they are formed from soft soil brought and deposited by rivers. Because farming is easy here, water is available, and building roads and cities is convenient — nearly half the world's population lives in plains. The Ganga plains (formed from soil deposited by the Ganga-Brahmaputra) are India's most fertile regions — the highest crop production comes from here.
Erosion and Deposition — The Landform Makers
Rivers, glaciers, wind, and oceans change the land in two ways: Erosion — wearing away the land: a river carries away rocks and soil along its path; this forms valleys, waterfalls (like Jog Falls), and curved river paths (meanders). Deposition — placing the carried material somewhere else: rivers deposit soft soil along their banks (flood plains) and at their mouth form a delta (a triangular piece of land). The Ganga-Brahmaputra's Sundarbans delta is the world's largest delta. Glaciers also play a major role in erosion and deposition — rivers like the Ganga and Yamuna originate from the glaciers of the Himalayas.
Key Concepts
Revision ke liye ek nazar — exam se pehle yahi padhna hai.
- 01Mountain: Very high raised land. Types: fold mountains (formed by bending of Earth's surface — Himalayas), block mountains (formed by breaking), volcanic mountains (formed by lava — Kilimanjaro).
- 02Plateau: An elevated flatland whose top surface is flat — called a 'tableland'. The Deccan Plateau is India's largest plateau. These areas are rich in minerals (mines).
- 03Plain: Completely open, flat land — formed from soil deposited by rivers. The Ganga plains are India's most fertile regions — the largest number of people live here.
- 04River landforms: In the upper part — valley and waterfall, in the middle — meander (curved path), at the mouth — delta, where the river meets the ocean. The Ganga-Brahmaputra delta (Sundarbans) is the world's largest delta.
- 05Glacier: A river of ice — the source from which our major rivers (Ganga, Yamuna) originate. As it descends from mountains, the river cuts through the land (erosion) and deposits soil in the plains (deposition).
Questions & Solutions
Pehle khud try karo — phir solution kholo. Yahi tariqa topper banata hai.
How are fold mountains formed? Give one example.
Why is a plateau called a 'tableland'?
Why do the most people live in plains?
What is a delta? Which is the world's largest delta?
What is a glacier and what do we get from it?
What is the difference between erosion and deposition?
Three major landforms: mountains (fold/block/volcanic), plateaus (tableland, minerals), and plains (fertile, high population). A river cuts the land above (erosion) and fills it below (deposition) — a delta is formed at the mouth where the river meets the ocean. Humans have learned to live and adapt everywhere.
Chapter-end quiz
4 MCQsOption tap karo — turant pata chalega sahi ya galat, explanation ke saath.
Q1.What type of mountains are the Himalayas?
Q2.What is called a tableland?
Q3.Which is the world's largest delta?
Q4.What is a glacier?
Mark karo — dashboard par progress dikhega.