A brief review of the previous class and doubts. (5:08 PM)

Types of Mass Movements. 

• Slow:
• Creep: The slow downhill movement of the soil and weathered mantle along the mountain slopes. 
• It is a continuous movement but difficult to notice 
• Solifluction: It involves the slow movement of soil mixed with water as a viscous fluid
• It is more active in glacial areas 
• Rapid:
• Landslide: A landslide is the movement of a cross-section of a hill slope under the influence of gravity is called as landslide 
• The material maintains continuous contact with the surface as it moves  
• Avalance: Similar to landslides, is sudden collapse and sliding of snow-covered regions 
• Earthflow: Thye occur along terraces and hillsides that are capable of flowing as a single unit when saturated with water below the top layer 
• Mudflow: It involves the rapid movement of masses of uncompacted soil ie suddenly saturated with water 
• Rock slide/fall: It is a rapid movement including rock material either sliding along the mountain slopes (rock slide) or falling vertically 

Landforms: (6:04 PM)

• Agent and its topography:
• River - Fluvial Topography 
• Ground - Karst topography 
• Waves - marine Topography 
• Wind - Desert or Arid Topography 
• Glacier - Glacial topography 
• Each causes erosional as well as depositional topography 

Riverine Topography: 

• It is a topography which is built by riverine erosional and deposition 
• 3 stages in riverine topography: Youth Stage, Mature Stage, and Old Stage 

• Index	Youth Stage	Mature Stage	Old Stage
  Slope	High	Moderate	Low
  Energy	High	Moderate	Low
  Erosion	High - Vertical	Moderate Lateral	Low or No erosion
  Deposition	Very low	Moderate	High
  Meandering	No	Moderate	High

Features of Riverine Topography: (6:52 PM)

• Topography	Processes	Erosional	Depositional
  Riverine (Agent - River water)	Corrasion  Attrition  Cavitation  Corrosion  Hydraulic  V-Shaped Valleys	V-Shaped Valleys  Gorge and Canyon  Waterfall, Cataract, Rapids  Plunge pools and Pot Holes River Capture and wind Gap Meander - River Cliff	Slip of slope Levee Flood Plain  Ox-Bow lakes  Alluvials fans and Delta Estuary

Topics for the next class: Continuation of Landforms, etc