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Oceanography
Geography
Useful for: UPSC Civil Services, OSSC RHT — Regular High School Teacher, OSEPA Upper Primary — Arts, OSSC Geography, OSSSC Govt TGT Arts, SSB Lecturer (Degree Colleges), SSB TGT Arts
Overview
Oceanography covers ocean floor relief, temperature and salinity, currents and tides, and features like coral reefs.
Key points
- Ocean floor: continental shelf, slope, rise, abyssal plain, trenches; the Mariana Trench’s Challenger Deep is the deepest point (about 11 km).
- Average ocean salinity is about 35 parts per thousand.
- Warm currents: Gulf Stream, Kuroshio; cold currents: Labrador, Humboldt (Peru), Benguela, Canary, California.
- Spring tides occur at new and full moon; neap tides at the quarter phases.
- Coral reefs need warm, clear, shallow, salty water.
- Cold currents along west coasts of continents help form coastal deserts (e.g. Atacama with the Humboldt Current).
Explanation
- Upwelling of cold, nutrient-rich water supports fisheries (e.g. off Peru).
- Salinity is higher in enclosed, hot, dry seas.
- El Niño weakens Peruvian upwelling.
- Coral bleaching follows heat stress.
- Thermohaline circulation links global oceans.
Step by step
- Identify the concept, law or fact asked.
- Recall the definition, formula, example or year.
- Apply it and eliminate mismatched options.
Examples
- Statement: "Spring tides occur at the half-moon phases." → Incorrect (new and full moon).
- Statement: "The Humboldt Current is a cold current." → Correct.
- Statement: "Average ocean salinity is about 35 parts per thousand." → Correct.
Traps and advanced points
- Trap: Mixing spring and neap tides.
- Trap: Calling the Gulf Stream cold.
- Trap: Placing corals in cold, deep water.
Quick revision
- Challenger Deep ~11 km.
- Salinity ~35‰.
- Spring tide: new/full moon.
Practice MCQs
From the perspective of definition and scope, which one of the following statements about Oceanography is correct?
- Oceanography has no exceptions or limitations in exam analysis.
- Ocean currents redistribute heat and influence coastal climate and marine productivity.
- All major ocean currents are driven exclusively by tides.
- Oceanography is unrelated to institutions, processes or real-world applications.
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Answer: (b) Ocean currents redistribute heat and influence coastal climate and marine productivity.. Ocean currents redistribute heat and influence coastal climate and marine productivity.
Consider the following statements on Oceanography, focusing on definition and scope: 1. Ocean currents redistribute heat and influence coastal climate and marine productivity. 2. Upwelling brings nutrient-rich deeper water toward the surface. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
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Show answer
Answer: (c) Both 1 and 2. Both statements are correct.
With reference to Oceanography (definition and scope), consider the following statements: 1. Ocean currents redistribute heat and influence coastal climate and marine productivity. 2. All major ocean currents are driven exclusively by tides. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (a) 1 only. Only statement 1 is correct.
Consider the following statements on Oceanography, focusing on working mechanism: 1. All major ocean currents are driven exclusively by tides. 2. Tides are primarily driven by gravitational interactions involving the Moon and Sun. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
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Show answer
Answer: (b) 2 only. Statement 2 is correct; Statement 1 is a common misconception.
Consider the following statements on Oceanography, focusing on practical application: 1. Thermohaline circulation is related to density differences influenced by temperature and salinity. 2. Ocean currents redistribute heat and influence coastal climate and marine productivity. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (c) Both 1 and 2. Both statements are correct.
Consider the following statements on Oceanography, focusing on institutional design: 1. Upwelling brings nutrient-rich deeper water toward the surface. 2. Thermohaline circulation is related to density differences influenced by temperature and salinity. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (c) Both 1 and 2. All the given statements are correct, so the answer is (C) Both 1 and 2. Both statements are correct.
With reference to Oceanography (definition and scope), consider the following statements: 1. All major ocean currents are driven exclusively by tides. 2. Upwelling brings nutrient-rich deeper water toward the surface. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (b) 2 only. Only statement 2 is correct, so the answer is (B) 2 only. Statement 1 is incorrect — it is an overstated or wrong claim. Correct position: Ocean currents redistribute heat and influence coastal climate and marine productivity. Statement 2 is correct.
With reference to Oceanography (practical application), consider the following statements: 1. All major ocean currents are driven exclusively by tides. 2. Upwelling brings nutrient-rich deeper water toward the surface. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (b) 2 only. Only statement 2 is correct, so the answer is (B) 2 only. Statement 1 is incorrect — it is an overstated or wrong claim. Correct position: Ocean currents redistribute heat and influence coastal climate and marine productivity. Statement 2 is correct.
With reference to Oceanography (institutional design), consider the following statements: 1. Thermohaline circulation is related to density differences influenced by temperature and salinity. 2. All major ocean currents are driven exclusively by tides. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (a) 1 only. Only statement 1 is correct, so the answer is (A) 1 only. Statement 1 is correct. Statement 2 is incorrect — it is an overstated or wrong claim. Correct position: Ocean currents redistribute heat and influence coastal climate and marine productivity.
With reference to Oceanography (working mechanism), consider the following statements: 1. All major ocean currents are driven exclusively by tides. 2. Tides are primarily driven by gravitational interactions involving the Moon and Sun. Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Read chapter notes · Similar questions
Show answer
Answer: (b) 2 only. Only statement 2 is correct, so the answer is (B) 2 only. Statement 1 is incorrect — it is an overstated or wrong claim. Correct position: Ocean currents redistribute heat and influence coastal climate and marine productivity. Statement 2 is correct.
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