NCERT Class 7 Geography Chapter 3: Our Changing Earth YouTube Lecture Handouts

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Watch Video Lecture on YouTube: NCERT Class 7 Geography Chapter 3: Our Changing Earth

NCERT Class 7 Geography Chapter 3: Our Changing Earth

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Evolution of Landforms

Image of Evolution of Landforms

Image of Evolution of Landforms

Volcano

Watch Video Lecture on YouTube: Watch Vulcanicity, Volcanoes - Types and 5 Basis for Classification

Vulcanicity, Volcanoes - Types and 5 Basis for Classification

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Image of Gases And Ash

Image of Gases and Ash

Earthquakes

Image of Earthquakes

Image of Earthquakes

Earthquake Preparedness

  • Measured by Richter Scale

  • Safe Spot – Under a kitchen counter, table or desk, against an inside corner or wall.

  • Stay Away from – Fire places, areas around chimneys, windows that shatter including mirrors and picture frames.

  • Be Prepared – Spread awareness amongst your friends and family members and face any disaster confidently.

  • Watch Video Lecture on YouTube: Earthquakes - Causes, Distribution, Impact & 4 Types of Waves

    Earthquakes - Causes, Distribution, Impact & 4 Types of Waves

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Weathering & Erosion

  • Weathering: Breaking up of the rocks on the earth’s surface.

  • Erosion: Wearing away of the landscape by different agents like water, wind and ice.

  • Watch Video Lecture on YouTube: Weathering & Erosion - 3 Types and 6 Agents

    Weathering & Erosion - 3 Types and 6 Agents

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Water (River) Action

  • Waterfall – Angel Falls (Venezuela – Highest)

    • Niagara Falls (b/w Canada & USA)

    • Victoria Falls (b/w Zambia & Zimbabwe in Africa)

  • Meander – Twists and turns

  • Floodplains – fertile flat areas

  • Leaves – Raised banks

  • Oxbow Lake

  • Delta

  • Watch Video Lecture on YouTube: Tenacious Rivers - 5 Major Fluvial Erosional Landforms

    Tenacious Rivers - 5 Major Fluvial Erosional Landforms

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  • Watch Video Lecture on YouTube: 7 Major Fluvial Depositional Landforms - Carving the Face of the Earth

    7 Major Fluvial Depositional Landforms - Carving the Face of the Earth

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Sea Action

Watch Video Lecture on YouTube: Coastal Landforms (By Waves & Currents): 18 Erosional & 18 Depositional Features

Coastal Landforms (By Waves & Currents): 18 Erosional & 18 Depositional Features

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Image of Sea Action

Image of Sea Action

Glaciers

  • Known as rivers of ice

  • Moraines: Depositions by glaciers

  • Watch Video Lecture on YouTube: Glacial Landforms: 25 Erosional & 3 Depositional Features

    Glacial Landforms: 25 Erosional & 3 Depositional Features

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Wind Action

  • Loess: Sand deposited in large areas – China

  • Sand Dunes

  • Mushroom Rocks

  • Watch Video Lecture on YouTube: Aeolian Landforms (By Wind) - 13 Erosional & 3 Depositional Landforms

    Aeolian Landforms (By Wind) - 13 Erosional & 3 Depositional Landforms

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