CBSE Class 7 > Class 7 Notes > Social Studies (SST) (Old NCERT) > PPT: Our Changing Earth
PPT: Our Changing Earth
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Page 1 OUR CHANGING EARTH KICKSTARTER TUTORIALS STD VII Page 2 OUR CHANGING EARTH KICKSTARTER TUTORIALS STD VII Page 3 OUR CHANGING EARTH KICKSTARTER TUTORIALS STD VII CHANGES IN THE EARTH SURFACE Mountains Volcano Mushroom Rock Delta Sea Arches Sand Dunes Page 4 OUR CHANGING EARTH KICKSTARTER TUTORIALS STD VII CHANGES IN THE EARTH SURFACE Mountains Volcano Mushroom Rock Delta Sea Arches Sand Dunes The changes on the Earth surface is due to two types of forces. 1. ENDOGENIC (Endogenous) FORCE 2. EXOGENIC (Exogenous) FORCE Page 5 OUR CHANGING EARTH KICKSTARTER TUTORIALS STD VII CHANGES IN THE EARTH SURFACE Mountains Volcano Mushroom Rock Delta Sea Arches Sand Dunes The changes on the Earth surface is due to two types of forces. 1. ENDOGENIC (Endogenous) FORCE 2. EXOGENIC (Exogenous) FORCE ENDOGENIC (Endogenous) FORCESRead More
FAQs on PPT: Our Changing Earth
| 1. What causes earthquakes and why do they happen so frequently in certain parts of the world? |  |
Ans. Earthquakes occur when stress accumulated in the Earth's crust is suddenly released, causing the ground to shake. They happen most frequently along tectonic plate boundaries where plates collide, slide past each other, or pull apart. Regions like the Pacific Ring of Fire experience frequent seismic activity because multiple plates converge there, creating zones of intense geological instability and tectonic movement.
| 2. How do volcanoes form and what's the difference between active and dormant volcanoes? | |
Ans. Volcanoes form where molten rock from the Earth's mantle rises through weaknesses in the crust and erupts at the surface. Active volcanoes erupt regularly or have erupted recently, while dormant volcanoes haven't erupted for long periods but may become active again. Extinct volcanoes are unlikely to erupt ever again, having lost their magma supply and showing no signs of geological activity or pressure buildup.
| 3. Why do mountains keep getting taller and what forces shape mountain ranges? | |
Ans. Mountains grow taller through tectonic plate collisions that thrust rock layers upward over millions of years. Convergent boundaries, where plates push against each other, create massive mountain ranges through folding and faulting of rock formations. Erosion and weathering simultaneously wear down peaks, but new uplift from plate movement often occurs faster, resulting in net mountain growth and landscape transformation.
| 4. What exactly happens during weathering and erosion, and how are they different processes? | |
Ans. Weathering breaks down rocks into smaller fragments through physical, chemical, or biological processes without moving them, while erosion transports these fragments to new locations using water, wind, ice, or gravity. Physical weathering includes freezing, thawing, and exfoliation; chemical weathering dissolves rock through reactions with water and oxygen. Erosion reshapes landforms like valleys, plateaus, and plains by continuously removing material from slopes and depositing it elsewhere.
| 5. How do oceans and rivers change the Earth's surface, and what landforms do they create? | |
Ans. Water bodies reshape Earth's surface through continuous erosion and deposition processes. Rivers carve valleys, gorges, and deltas by cutting through rock layers and depositing sediment at their mouths. Ocean waves and currents create coastal features like beaches, cliffs, and spits, while groundwater dissolves soluble rocks to form caves and sinkholes, fundamentally altering landscapes over geological timescales.
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Document Description: PPT: Our Changing Earth for Class 7 2026 is part of Social Studies (SST) Class 7 (Old NCERT) preparation. The notes and questions for PPT: Our Changing Earth have been prepared according to the Class 7 exam syllabus. Information about PPT: Our Changing Earth covers topics like and PPT: Our Changing Earth Example, for Class 7 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT: Our Changing Earth.
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