Chapter 12 of 17
Revision Notes
Hydrosphere — Revision Notes
Gujarat Board · Class 11 · Geography
Hydrosphere revision notes for Gujarat Board Class 11 Geography: 4 topics in quick points. Part of the Gujarat Board Class 11 Geography syllabus.
40 questions25 flashcards5 concepts
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Key Topics to Revise
1
Water Cycle (Hydrological Cycle)
- Water exists in three forms on Earth: solid (ice), liquid (water), and gas (water vapor)
- Solar heat causes evaporation from seas, lakes, and rivers, forming clouds
- Condensation occurs under favorable conditions, leading to precipitation
2
Relief Features of Ocean Floor
- Ocean floor has four main relief features: Continental Shelf, Continental Slope, Abyssal Plains, and Deep Sea Trenches
- Continental Shelf extends up to 200 meters depth and covers 8% of ocean floor
- Average width of continental shelf is 65 km with average depth of 130 meters
3
Temperature of Sea Water
- Average surface temperature of ocean water is 17°C
- Pacific Ocean: 19°C, Indian Ocean: 17°C, Atlantic Ocean: 16.9°C
- Sunrays cannot penetrate below 200 meters, so surface is warmer
4
Salinity of Ocean Water
- Average salinity of sea water is 35‰ (35 grams of salt per 1000 grams of water)
- Salinity measured in ‰ (per thousand) units
- Higher in tropical regions due to more evaporation
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Full NotesKey Concepts
The continuous process where ocean waterFour major featuresAverage surface temperature is 17°C globallyAverage salinity is 35‰ (35 gramsSystematic rise and fall of sea
Frequently Asked Questions
What are the important topics in Hydrosphere for Gujarat Board Class 11 Geography?
Key topics in Hydrosphere include Water Cycle (Hydrological Cycle), Relief Features of Ocean Floor, Temperature of Sea Water, Salinity of Ocean Water. Study these first, then practise questions on each for Class 11 exams.
How should I revise Hydrosphere for Class 11 exams?
Learn the core ideas first, then work through the 40 practice questions on Hydrosphere. 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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