7th Geography Ncert Chapter 3

Important Topics to Study from the Chapter:

1. Endogenic and Exogenic Forces:

– Summary: Endogenic forces originate from the Earth's interior, causing movements like earthquakes and volcanic eruptions. Exogenic forces act on the Earth's surface, leading to erosion and deposition.

2. Plate Tectonics:

– Summary: Earth's lithosphere is divided into plates that slowly move due to the circular movement of molten magma inside the Earth, resulting in changes on the Earth's surface.

3. Earthquakes:

– Summary: Earthquakes are caused by the movement of lithospheric plates, resulting in vibrations on the Earth's surface. The magnitude of earthquakes is measured using the Richter scale.

4. Volcanoes:

– Summary: Volcanoes are vents in the Earth's crust that erupt molten material. They are a result of forces within the Earth.

5. Landform Formation:

– Summary: Landforms are shaped by processes like weathering, erosion, and deposition by agents like water, wind, and ice. River erosion forms features like waterfalls, meanders, and deltas while sea waves create coastal landforms like sea caves.

Students can focus on these topics and their summaries to effectively revise the chapter on "Our Changing Earth" from the provided document.