Topic of the Day: Diastrophism Category: Geography
Today’s Topic of the Day is ‘Diastrophism’ which is one of the topics in NCERT Geography textbook Class XI.
The Topic of the Day (ToD) will help the aspirants to know the basic concepts and make their foundation strong while preparing for UPSC IAS Exam. Reading Topic of the Day religiously will mould the aspirants to prepare for Current affairs in a very effective way and make relevant current affairs notes for IAS exam.
All processes that move, elevate or build up portions of the earth’s crust come under diastrophism. They include:
- Orogeny processes comprising mountain building through severe folding and affecting long and narrow belts of the earth’s crust
- Epeirogenic processes encompassing warping or uplift of large parts of the earth’s crust
- Earthquakes involving local relatively minor movements
- Plate tectonics involving horizontal movements of crustal plates.
In the course of orogeny, the crust is harshly deformed into folds and due to epeirogeny, there may be simple deformation. Epeirogeny is continental building process whereas Orogeny is a mountain building process. Through the processes of epeirogeny, orogeny, earthquakes and plate tectonics, there can be faulting and cracking of the crust. All these processes cause temperature, volume, and pressure (PVT) changes which in turn encourage metamorphism of rocks.
Also see other notes on Geography topics:
|Motions of the Earth|