Structure and Physiography — Chapter Summary

Earth is approximately 4600 million years

Earth is approximately 4600 million years old. The Indian plate was once south of the equator and much larger, with the Australian plate as part of it

India is divided into the Peninsular

India is divided into the Peninsular Block, the Himalayas and other Peninsular Mountains, and the Indo-Ganga-Brahmaputra Plain. These divisions reflec

The Peninsular Block is an ancient

The Peninsular Block is an ancient, rigid landmass made mainly of very old gneisses and granites. It has stood as a stable block since the Cambrian pe

These mountains are young

These mountains are young, weak, and flexible in structure. They are tectonic in origin and are still being shaped by exogenic and endogenic forces, w

This plain began as a geo

This plain began as a geo-synclinal depression and reached maximum development about 64 million years ago during the third phase of Himalayan mountain