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

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NCERT Class 7 Geography Chapter 3: Our Changing Earth

Evolution of Landforms

Evolution of Landforms

Volcano

Vulcanicity, Volcanoes - Types and 5 Basis for Classification
Gases and Ash

Earthquakes

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

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.
  • Weathering & Erosion - 3 Types and 6 Agents

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
  • Tenacious Rivers - 5 Major Fluvial Erosional Landforms
  • 7 Major Fluvial Depositional Landforms - Carving the Face of the Earth

Sea Action

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

Glaciers

  • Known as rivers of ice
  • Moraines: Depositions by glaciers
  • Glacial Landforms: 25 Erosional & 3 Depositional Features

Wind Action

  • Loess: Sand deposited in large areas – China
  • Sand Dunes
  • Mushroom Rocks
  • Aeolian Landforms (By Wind) - 13 Erosional & 3 Depositional Landforms

✍ Manishika