Chapter 15 of 31
Revision Notes
Land slides, Volcanoes, Earthquakes and Tsunamis — Revision Notes
Telangana Open School (TOSS) · Class 12 · Geography
Land slides, Volcanoes, Earthquakes and Tsunamis revision notes for Telangana Open School (TOSS) Class 12 Geography: 4 topics in quick points.
44 questions25 flashcards5 concepts
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Key Topics to Revise
1
Natural Hazards and Disasters
- A hazard is a dangerous condition that has the potential to harm people or property.
- A disaster occurs when a hazard causes large-scale damage beyond a community’s ability to cope.
- Disasters result from the combination of hazard, vulnerability, and lack of capacity to respond.
2
Earthquakes
- Earthquakes are caused by sudden movement along faults in the Earth's crust.
- Main causes: tectonic plate movement, volcanic activity, fault zones, and human activities like mining or reservoirs.
- Effects include ground shaking, landslides, soil liquefaction, structural collapse, and tsunamis.
3
Tsunamis
- Tsunami means 'harbour wave' in Japanese — formed by sudden displacement of ocean water.
- Main causes: underwater earthquakes, volcanic eruptions, landslides, or meteorite impacts.
- Tsunami waves travel fast in deep sea (500–1000 km/h) but grow tall near coastlines due to shoaling.
4
Volcanoes
- A volcano is a vent in the Earth's crust that releases lava, ash, and gases from magma below.
- Volcanism is caused by convection currents in the mantle creating weak zones in the crust.
- India has two volcanic islands: Barren Island and Narcondam Island in the Andamans.
Get complete notes with diagrams and examples
Full NotesKey Concepts
A natural hazard is a dangerousAn earthquake is a sudden shakingA tsunami is a seriesA volcano is an openingA landslide is the downward movement
Frequently Asked Questions
What are the important topics in Land slides, Volcanoes, Earthquakes and Tsunamis for Telangana Open School (TOSS) Class 12 Geography?
Key topics in Land slides, Volcanoes, Earthquakes and Tsunamis include Natural Hazards and Disasters, Earthquakes, Tsunamis, Volcanoes. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Land slides, Volcanoes, Earthquakes and Tsunamis for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Land slides, Volcanoes, Earthquakes and Tsunamis. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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