October 2021

Geography Notes for UPSC

Depositional Landforms – Landform and their Evolution

There are two types of sedimentary landforms: depositional and erosional. Depositional landforms result from layers of sediment being deposited by water, wind or ice. Erosional features occur when the mechanical actions of glaciers, rivers and waves have removed materials from the earth’s surface, the action having been defined as either “Abrasion” or “Scouring”. 1. Alluvial

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Geography Notes for UPSC

Overland flow: Causes sheet erosion

Water flows over the land surface in much the same way as it flows over a carpet, following paths of least resistance. The difference is that water slowly erodes the land where the flow is concentrated. Overland flow tends to be concentrated along roads, railway banks and contours. Depending upon irregularities of the land surface,

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Geography Notes for UPSC

Soil Formation – Geomorphic Processes

Soil forms continuously, but slowly, from the gradual breakdown of rocks through weathering. Soil can be formed in a number of different ways including chemical or physical means which often take place simultaneously. Weathering can be a physical, chemical or biological process: Physical weathering: breakdown of rocks from the result of a mechanical action. Temperature

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