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  LANDSLIDE Process involving the downward movement of a part of the slope forming material due to the action of gravity. 15% of land area prone to landslides and avalanches Prone areas – Himalayas, Northeastern India and Meghalaya Plateau, Western Ghats and Nilgiris CAUSES: Tectonic- Triggered by earthquakes. Slope failure Soil piping Soil erosion Avalanches and GLOF events cause landslide High intensity Rains- Cloudburst, Vagaries of Monsoon. Anthropogenic factors Mining and tunneling in hilly areas. Deforestation and land use change patterns Mismanagement of river embankments Illegal construction on slopes Improper management of slope                                                           ...

  Soil Structure It is defined by the way individual particles of sand, silt, and clay are assembled. Single particles when assembled appear as larger particles. These are called aggregates. Based on the size and shape of peds, there are different structures. Some of them are 1. Granular and crumb structures are individual particles of sand, silt and clay grouped together in small, nearly spherical grains. Water circulates very easily through such soils. They are commonly found in the A-horizon of the soil profile 2. Blocky and sub angular blocky structures are soil particles that cling together in nearly square or angular blocks having more or less sharp edges. Relatively large blocks indicate that the soil resists penetration and movement of water. They are commonly found in the B-horizon where clay has accumulated; 3. Prismatic soil particles that are formed into vertical prismatic structure. Similar to  columnar structure. 4. Columnar structures are soil particles...