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Revision Notes

Ocean Deposits

Telangana Open School (TOSS) · Class 12 · Geography

Quick revision notes for Ocean Deposits — Telangana Open School (TOSS) Class 12 Geography. Key concepts, formulas, and definitions for last-minute revision.

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 Notes

Key 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?
Ocean Deposits covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Ocean Deposits — Telangana Open School (TOSS) Class 12 Geography?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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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