LECTURE 03: DSSSB TGT AND PGT: GEOGRAPHY NCERT CLASS 7

Chapter 3 of the Class 7 NCERT Geography textbook is titled "Our Changing Earth1
." Here's a detailed summary:

Our Changing Earth
Endogenic and Exogenic Forces
Endogenic Forces: These are forces that originate from within the Earth and cause changes on its surface2
. Examples include earthquakes and volcanic eruptions2
.

Exogenic Forces: These forces work on the Earth's surface and cause changes over time2
. Examples include weathering, erosion, and deposition3
.

Earthquakes and Volcanoes
Earthquakes: Sudden movements of the Earth's crust caused by the release of energy stored in rocks2
. They can cause significant damage and are measured using a seismograph2
.

Volcanoes: Openings in the Earth's crust through which molten lava, ash, and gases are ejected2
. They can create new landforms and impact the environment.

Weathering and Erosion
Weathering: The breaking down of rocks into smaller particles by physical, chemical, and biological processes3
.

Erosion: The process by which weathered rock particles are transported away by agents like water, wind, and ice3
. This process creates various landforms such as valleys, cliffs, and sand dunes3
.

Depositional Features
Flood Plains: Flat areas adjacent to rivers that are formed by the deposition of sediments during floods3
.

Sand Dunes: Hills of sand formed by the wind in desert areas3
.

Beaches: Formed by the deposition of sediments along the shore by sea waves3
.

Ox-Bow Lakes: Formed when a meander in a river is cut off, creating a U-shaped lake3
.

Human Impact
Human activities can accelerate natural processes like erosion and weathering, leading to environmental changes and challenges.

Conclusion
Understanding these natural processes helps us appreciate how the Earth's surface is constantly changing and the role humans play in these changes.

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