STUDY NOTES FOR SSC AND STATE LEVEL EXAMS Write us :
[email protected] www.mahendras.org www.mahendraguru.com myshop.mahendras.org STUDY NOTES FOR SSC AND STATE LEVEL EXAMS MOUNTAINS & RIVERS Mountains come under the second order of relief features. This is a portion of land surface rising considerably above the surrounding country, either as a single eminence or in a range or chain. A mountain may have several forms. • Mountain Ridge - a system of long, narrow and high hills. • Mountain Range - a system of mountain and hills having several ridges. • Mountain Chain - Consists of several parallel, long and narrow mountains of different periods • Mountain Group - Consists of several unsystematic patterns of different mountain system. • Mountain system - Consist of different mountain ranges of the same period. Types of Mountains 1. Folded Mountains (Geosynclines) • Most of the Fold Mountains are the youngest mountains in the world. • The main examples are the Himalayas, the Alps, Rockies, and the Andes. • The Fold Mountains are formed by compression when two hori zontal forces act towards a common point that compresses the intervening rock strata to produce fold mountains. • The fold consists of two inclined parts called limbs, the upper portion is called anticlines, while the lower portion is called synclines. On the basis of the period of origin folded mountains are divided into: (i) Old Folded Mountains: All the folded mountains originating before the tertiary period come under the category of old folded mountains, e.g., the old folded mountains of Calledonian and Write us :
[email protected] www.mahendras.org www.mahendraguru.com myshop.mahendras.org STUDY NOTES FOR SSC AND STATE LEVEL EXAMS Hercynian periods, such as the Aravalis, Appalachians etc.