Class IX – Social Science (Geography)

Chapter 2: Shaping of the Earth\'s Surface

Doodle PowerPoint Presentation | 55 Slides | Session 2026-27

Unique Study Point (USP) | Sumeet Sahu | Indore | uniquestudyonline.com

This presentation covers the complete Chapter 2 – Shaping of the Earth\'s Surface in an engaging doodle style with exam-focused points, landform diagrams, disaster case studies, and practice questions after every topic.

Topic 1 – Plate Tectonics

• Earth\'s interior: Crust, Mantle, Outer Core, Inner Core
• Lithosphere and Asthenosphere – definition and role
• What is Plate Tectonics? (Theory by W.J. Morgan)
• Types of tectonic plates: Continental, Oceanic, Mixed
• Major plates: North American, South American, Pacific, African, Eurasian, Indo-Australian, Antarctic
• Convection currents – why plates move
• Plate Boundaries: Convergent, Divergent, Transform
• Effects: Ring of Fire, earthquakes, volcanoes, fold mountains
• India\'s earthquake risk – Gujarat 2001, Himalayan Belt, Kachchh
• Did You Know: Earthquakes in Ancient India (Varahamihira), India\'s only Mud Volcano (Baratang Island)

Topic 2 – Weathering and Erosion

• Weathering: Physical, Chemical, Biological – definitions and examples
• Erosion: Wearing away AND moving of rock/soil by natural agents
• Difference between weathering and erosion
• Types of erosion: Water, Wind, Glacial, Coastal
• Erosion and Human Life: Impact on farmers, river/coast dwellers, construction, tourism, fishing
• Stopping Erosion: Traditional techniques – Contouring, Bunding, Terracing
• Sindhu-Saraswati civilisation connection to erosion control

Topic 3 – Agents of Gradation

• Definition: Natural forces that wear down, transport and deposit material to level the Earth\'s surface
• Landforms and Human Civilisation – how geography shaped settlements and trade
• Agent 1 – Running Water (Rivers): Upper, Middle, Lower course landforms; Waterfall, Meander, Delta; Example: Sundarbans Delta, Grand Anicut
• Agent 2 – Waves and Currents: Beach, Bay, Headland, Sea Cliff, Sea Cave, Sea Arch, Sea Stack; coastal erosion and deposition landforms
• Agent 3 – Glaciers: U-shaped valleys, Cirques, Aretes, Hanging Valleys, Fjords; Moraines (Lateral, Medial, Terminal); uses for tourism, trekking, irrigation
• Agent 4 – Wind: Yardangs, Ventifacts, Deflation Hollows/Blowouts, Desert Pavements; Dunes (Barchan, Longitudinal, Star, Parabolic); Oasis
• Agent 5 – Underground Water: Karst Topography in limestone areas; Caves, Stalactites, Stalagmites, Sinkholes (Dolines), Underground Rivers

Topic 4 – Landforms and Disasters

• Landslides: Natural and human causes; prone areas; mitigation measures
• Avalanches: Sudden sliding of large amounts of snow; triggers; mitigation
• GLOFs (Glacial Lake Outburst Floods): Sudden release of glacial lake water; causes; effects
• Case Study: Chamoli Flood 2021 – Uttarakhand; impact on buildings, roads, bridges, hydel projects
• Dust Storms: Strong winds lifting loose dry soil; prone areas; mitigation

Quick Recap and NCERT Questions

• Before We Move On – complete chapter recap (internal and external forces, agents of gradation, disasters)
• NCERT Questions and Activities (Set 1, 2 and 3) – all 16 questions and activities from the textbook
• Practice Time slides after every topic for exam revision

Key Exam Facts

• Earth\'s crust: 5–40 km thick; Mantle: solid, ~2900 km; Outer Core: fluid iron and nickel; Inner Core: solid, densest
• Plates move a few centimetres per year due to convection currents
• Convergent boundary: plates move towards each other → fold mountains, volcanoes
• Divergent boundary: plates move apart → mid-ocean ridges (e.g. Mid-Atlantic Ridge)
• Transform boundary: plates slide past each other → earthquakes (e.g. San Andreas Fault, USA)
• Ring of Fire = zone around Pacific Ocean with most earthquakes and volcanoes
• Weathering = breaking down rocks WITHOUT moving them
• Erosion = breaking down AND moving of rock/soil
• Waterfall forms where hard rock overlies soft rock; river drops over a steep cliff
• Meander forms in middle/lower course by erosion on outer bank and deposition on inner bank
• Delta = fan-shaped landform at river\'s mouth; Example: Sundarbans Delta
• Glacier = slow-moving river of ice
• Karst topography = landforms in limestone areas dissolved by underground water
• GLOF = Glacial Lake Outburst Flood; Chamoli 2021 is a key NCERT example
• Barchan dune = crescent-shaped; formed by wind from one direction
• Stalactites hang from cave ceiling; Stalagmites grow from cave floor

Download the PDF or view the PPT for the complete doodle-style visual presentation with diagrams and illustrations.

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