Yazd University Journal of Kavoshnameh in Persian Language and Literature 2645-453X 2 3 2002 02 20 Evidences of Environmental Changes in Arid and Semi-arid Regions Evidences of Environmental Changes in Arid and Semi-arid Regions 119 147 2216 10.29252/kavosh.2002.2216 FA Dariush Mehrshahi Assistant Professor of Geography, Yazd University Journal Article 2001 01 31 Arid and semi-arid areas cover more than 30 percent of the earth's lands. During the Quaternary period in reaction to glacial prigression and regression and climate changes, arid regions changed dramatically. Evidence of such environmental variations has been preserve with specific geomorphological, sedimentological, geochemical and biological features. This paper aims to introduce the evidence of climatic and environmental changes during Quaternary period, while classifying those pieces of evidence according to their nature, and origin. The study has been done through library work and the most significant features, in terms or their palaeoenvironmental nature, have been selected and classified. Careful analysis of the characteristics of palaeoenvironmental evidence in air lands can offer a basic foundation for local and regional planning. Arid and semi-arid areas cover more than 30 percent of the earth's lands. During the Quaternary period in reaction to glacial prigression and regression and climate changes, arid regions changed dramatically. Evidence of such environmental variations has been preserve with specific geomorphological, sedimentological, geochemical and biological features. This paper aims to introduce the evidence of climatic and environmental changes during Quaternary period, while classifying those pieces of evidence according to their nature, and origin. The study has been done through library work and the most significant features, in terms or their palaeoenvironmental nature, have been selected and classified. Careful analysis of the characteristics of palaeoenvironmental evidence in air lands can offer a basic foundation for local and regional planning. https://kavoshnameh.yazd.ac.ir/article_2216_24c38526ca5d860f4df5a61ea0f6b7ab.pdf