Q1.
Landforms are classified into three main types — mountains, plateaus and plains. They have very different physical characteristics and environments.
Answer
What this recap means, expanded:
| Mountain | Plateau | Plain | |
|---|---|---|---|
| Shape | Broad base, steep slopes, narrow summit | Raised, with a more or less flat top and often one steep side | Extensive, flat or gently undulating; no large hills or deep valleys |
| Height | Much higher than the land around; can be over 8,000 m | A few hundred to several thousand metres | Generally not more than 300 m above sea level |
| Soil | Thin, stony | Often rocky and less fertile — except lava plateaus, which have rich black soil | Deep and very fertile, built from river sediments |
| Vegetation | Montane forest — pine, fir, spruce, deodar; higher up, grasses, mosses and lichen | Varies greatly across the world; often scrub and dry forest | Crops and grassland; a wide variety of flora and fauna |
| Indian example | The Himalayas; the Aravalli Range; the Western Ghats | The Deccan Plateau; the Chhota Nagpur Plateau | The Ganga plain |
Two further points the chapter adds to this classification:
- Age matters as much as shape. Young mountains such as the Himalayas have tall, sharp peaks and are still growing; old ones such as the Aravalli have been worn round by erosion. Plateaus, too, can be young or old — the Deccan is one of the oldest in the world.
- Three is not the whole list. The Earth's surface is very complex, and experts define more landforms — the desert being one, hot like the Thar and the Sahara or cold like the Gobi.