Chapter 13 of 31
Revision Notes
Ocean Deposits — Revision Notes
Telangana Open School (TOSS) · Class 12 · Geography
Ocean Deposits revision notes for Telangana Open School (TOSS) Class 12 Geography: 4 topics in quick points. Includes Concept and Importance of Ocean.
44 questions30 flashcards5 concepts
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Key Topics to Revise
1
Concept and Importance of Ocean Deposits
- Ocean deposits are unconsolidated materials that settle at the bottom of oceans and are also called marine sediments.
- They include rocks, sand, organic matter, and minerals transported from land or formed in the ocean.
- Only a few areas like ocean ridges and strong current zones lack sediments due to continuous erosion.
2
Sources of Ocean Deposits
- Terrigenous origin: Materials from land like rocks, sand, and mud carried by rivers, winds, and glaciers.
- Volcanic sediments: Ash and debris from volcanic eruptions, either on land (subaerial) or under water (submarine).
- Marine organisms: Dead plankton (phytoplankton and zooplankton) contribute calcareous and siliceous skeletons.
3
Classification of Ocean Deposits
- John Murray classified ocean deposits into Terrigenous and Pelagic based on origin and location.
- Terrigenous deposits: Found on continental shelves and slopes; include gravel, sand, silt, clay, and mud.
- Gravel: 2–256 mm; includes boulders, pebbles, and granules.
4
Transportation and Distribution of Ocean Deposits
- Rivers, rainwash, and waves transport materials near coasts—first three agents.
- Glaciers, winds, volcanic activity, and biological activity carry sediments far into oceans.
- Glacial transport: Ice carries boulders to fine powder; important in polar regions.
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Full NotesKey Concepts
Ocean depositsSediments come from multiple sourcesDeposits are classified into Terrigenous (fromSediments are transported by riversTerrigenous deposits are common near coasts
Frequently Asked Questions
What are the important topics in Ocean Deposits for Telangana Open School (TOSS) Class 12 Geography?
Key topics in Ocean Deposits include Concept and Importance of Ocean Deposits, Sources of Ocean Deposits, Classification of Ocean Deposits, Transportation and Distribution of Ocean Deposits. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Ocean Deposits for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Ocean Deposits. 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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