concentration of various harmful elements, etc.<\/li>\n<\/ul>\nErosion is caused by natural and human factors. Deforestation, overgrazing and improper use of land also acclerates soil erosion. It is estimated that 130 million hectares of land are affected by erosion problems in the country. Shifting agriculture alone has affected about 30 million hectares.<\/p>\n
Besides erosion, salinisation and flooding caused due to construction of dam, reservoirs, canal and tanks in geologically unsuitable areas, excessive use of canal irrigation and diversion of floodwater in areas of impervious rocks also reduce the potentially of land. Because of over-irrigation, saline and alkaline areas have increased in the northern plains of the country. Irrigation also changes the structure of the soil. Besides,<\/p>\n
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use of chemical fertilisers, pesticides, insecticides and herbicides degrades the soil by destroying their natural, physical, chemical and biological properties. Chemical fertilisers destroy microorganisms of the soil. Steps should be taken to reduce land degradation. Afforestation on hill slopes, checking of grazing should be done. Proper irrigation techniques should be done. The use of fertilisers and pesticides should be reduced.<\/p>\n","protected":false},"excerpt":{"rendered":"
Detailed, Step-by-Step NCERT Solutions for Class 12 Geography Chapter 12 Geographical Perspective on Selected Issues and Problems Questions and Answers were solved by Expert Teachers as per NCERT (CBSE) Book guidelines covering each topic in chapter to ensure complete preparation. https:\/\/mcq-questions.com\/ncert-solutions-for-class-12-geography-chapter-12-part-b\/ Geographical Perspective on Selected Issues and Problems NCERT Solutions for Class 12 Geography Chapter …<\/p>\n
NCERT Solutions for Class 12 Geography Chapter 12 Geographical Perspective on Selected Issues and Problems<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[3],"tags":[],"yoast_head":"\nNCERT Solutions for Class 12 Geography Chapter 12 Geographical Perspective on Selected Issues and Problems - MCQ Questions<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n