Our Changing Earth Class 7 Extra Questions and Answers Free PDF Download
FAQs on CBSE Important Questions for Class 7 Social Science Our Changing Earth - 2025-26
1. What are the most important types of questions to prepare from Chapter 3, "Our Changing Earth," for the Class 7 exams?
For the 2025-26 exams, focus on conceptual questions about processes (like the work of rivers, wind, and glaciers), 'Give Reason' style questions, and diagram-based questions. Questions explaining the formation of landforms like meanders, sea arches, and mushroom rocks are frequently asked and are considered important.
2. How should I answer a 3-mark question asking for reasons behind landforms like mushroom rocks and fertile flood plains?
For a 3-mark question, provide clear, point-wise reasons. For example:
- Mushroom Rocks: Explain that winds in desert regions erode the lower section of a rock more than the upper part because they carry heavier sand particles close to the ground. This differential erosion creates a mushroom shape.
- Fertile Flood Plains: Mention that when a river floods, it deposits layers of fine soil and sediments called silt on its banks. This fresh layer of silt makes the land very fertile.
3. What is the key difference between landforms created by rivers and those created by glaciers?
The main difference lies in the agent of erosion and the resulting shapes. Rivers use flowing water to carve steep, V-shaped valleys, meanders, and ox-bow lakes. In contrast, glaciers are vast, slow-moving sheets of ice that carve wider, U-shaped valleys and deposit rocky debris in mounds called glacial moraines.
4. What key points are expected in an answer about earthquake preparedness from this chapter?
A good answer should cover three main areas: During an earthquake: Find a safe spot, such as under a kitchen counter or desk, and stay away from windows or heavy furniture. After an earthquake: Be prepared for aftershocks and move to an open area if possible. General preparedness: Being aware of emergency exits and discussing safety plans with family and friends.
5. Why are 'Give Reason' questions so common from the "Our Changing Earth" chapter in exams?
These questions are common because they test your understanding of cause and effect, which is a core concept in this chapter. They check if you can logically connect a natural process (like wind erosion) to its direct result (a mushroom rock). Answering them well shows a deeper understanding than just memorising definitions.
6. How are sea stacks formed? Explain the process for a short-answer question.
The formation of sea stacks is a step-by-step process. First, constant striking by sea waves forms cracks in coastal rocks, which widen into sea caves. Over time, erosion makes these caves bigger until only the roof remains, creating a sea arch. Eventually, the roof also erodes and collapses, leaving a tall, pillar-like rock formation in the sea, known as a stack.
7. Does the Earth's surface change suddenly or only slowly? Explain with examples from the chapter.
The Earth's surface changes in both ways. Slow changes are caused by forces like erosion and deposition from rivers, wind, and ice, which take thousands of years to create features like deltas or U-shaped valleys. Sudden changes are caused by endogenic forces, resulting in events like earthquakes and volcanic eruptions, which can alter the landscape in just minutes or hours.
8. Are diagrams important for scoring well on questions from "Our Changing Earth"?
Yes, absolutely. For questions about the work of a river, sea waves, or a glacier, including a simple, labelled diagram can significantly boost your marks. Drawing an ox-bow lake, a sea arch turning into a stack, or a waterfall shows the examiner that you have a very clear visual understanding of the geographical processes.
