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
Volcano
Vulcanicity, Volcanoes - Types and 5 Basis for Classification
Earthquakes
Earthquake Preparedness
- Measured by Richter Scale
- Safe Spot β Under a kitchen counter, table or desk, against an inside corner or wall.
- Stay Away from β Fire places, areas around chimneys, windows that shatter including mirrors and picture frames.
- Be Prepared β 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 earthΥs 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 β Angel Falls (Venezuela β Highest)
- Niagara Falls (b/w Canada & USA)
- Victoria Falls (b/w Zambia & Zimbabwe in Africa)
- Meander β Twists and turns
- Floodplains β fertile flat areas
- Leaves β 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
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 β China
- Sand Dunes
- Mushroom Rocks
- Aeolian Landforms (By Wind) - 13 Erosional & 3 Depositional Landforms
β Manishika