Our Changing Earth – Class 7 Geography Chapter 3 - Key Points
Our Changing Earth is an important chapter in Class 7 Geography that explains how natural forces continuously shape and reshape the Earth’s surface. Students learn about processes such as earthquakes, volcanoes, weathering, erosion, and deposition, which create different landforms on our planet.
In this post, you will find the key points of Our Changing Earth (Class 7 Geography Chapter 3) written in simple and clear language for quick revision. These points help students understand the main concepts of the chapter and are especially useful for last-minute exam preparation and better concept clarity.
Quick Revision – Our Changing Earth (Class 7 Geography Chapter 3)
Quick Revision – Our Changing Earth
- Endogenic Forces → Work inside the Earth
- Examples → Earthquakes, Volcanoes
- Exogenic Forces → Work on Earth’s surface
- Examples → Weathering, Erosion, Deposition
- Erosion → Wearing away of land
- Flood Plains → Fertile land formed by river deposits
- Sand Dunes → Heaps of sand formed by wind
- Ox-bow Lake → Crescent-shaped lake formed from river meanders
- Mushroom Rocks → Rock shapes formed by wind erosion
Key Points – Our Changing Earth (Quick Revision)
• The Earth’s surface is constantly changing due to natural forces.
• These forces are divided into endogenic forces and exogenic forces.
• Endogenic forces originate inside the Earth and cause earthquakes, volcanoes, folding, and faulting.
• Exogenic forces act on the Earth’s surface and include weathering, erosion, and deposition.
• Erosion is the process of wearing away of land by agents like water, wind, ice, and waves.
• Flood plains are flat fertile lands formed by deposition of sediments along river banks.
• Sand dunes are heaps of sand formed by wind deposition in desert areas.
• Beaches are formed when sea waves deposit sediments along the coast.
• Ox-bow lakes are crescent-shaped lakes formed when river meanders get cut off from the main river.
• Mushroom rocks are formed in deserts due to wind erosion.
FAQ (Helpful for Google SEO)
What are endogenic and exogenic forces?
Endogenic forces act inside the Earth and cause earthquakes and volcanoes, while exogenic forces act on the Earth’s surface and cause erosion, weathering, and deposition.
What is erosion?
Erosion is the process by which soil and rocks are worn away and carried from one place to another by natural agents like water, wind, ice, and waves.
How are sand dunes formed?
Sand dunes are formed when wind carries sand and deposits it in heaps, usually in desert regions.
What is an ox-bow lake?
An ox-bow lake is a crescent-shaped lake formed when a river meander gets cut off from the main river.
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