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Which of the following statements regarding the evolution of the Earth's atmosphere and oceans is/are correct?
i. The early atmosphere was primarily composed of hydrogen and helium, which were largely stripped away by solar winds.
ii. Photosynthesis by early life forms significantly decreased the levels of oxygen in the atmosphere.
iii. Continuous volcanic eruptions contributed to the addition of gases and water vapor to the atmosphere.
iv. The Earth's oceans formed within 500 million years of its formation, primarily through the condensation of water vapor.
  • a)
    i and ii
  • b)
    i and iii
  • c)
    ii and iv
  • d)
    i, iii, and iv
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following statements regarding the evolution of the Earth...
- Statement i is correct as the initial atmosphere was indeed primarily hydrogen and helium, which were stripped away by solar winds.
- Statement ii is incorrect; photosynthesis actually increased the levels of oxygen in the atmosphere, not decreased it.
- Statement iii is correct; volcanic eruptions contributed significantly to the composition of the atmosphere by releasing water vapor and gases.
- Statement iv is correct; the oceans did form as water vapor condensed and collected in depressions on the Earth's surface within 500 million years.
Thus, the correct answer is Option D: i, iii, and iv.
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Most Upvoted Answer
Which of the following statements regarding the evolution of the Earth...
Overview of Earth's Atmospheric Evolution
The evolution of the Earth's atmosphere and oceans is a complex process influenced by various geological and biological factors.
Correct Statements
- i. Early Atmosphere Composition
- The early atmosphere was indeed composed primarily of hydrogen and helium.
- These light gases were mostly lost to space due to solar winds, especially because the young Earth lacked a strong magnetic field to protect its atmosphere.
- iii. Volcanic Contributions
- Continuous volcanic eruptions played a significant role in shaping the early atmosphere.
- These eruptions released gases such as carbon dioxide, nitrogen, and water vapor, which helped form a thicker atmosphere over time.
- iv. Formation of Oceans
- The Earth's oceans formed relatively quickly after its formation, within approximately 500 million years.
- This process was largely due to the condensation of water vapor released from volcanic activity and possibly from icy comets.
Incorrect Statement
- ii. Photosynthesis and Oxygen Levels
- This statement is incorrect because photosynthesis by early life forms, particularly cyanobacteria, actually increased the levels of oxygen in the atmosphere, leading to the Great Oxidation Event.
Conclusion
Thus, the correct statements regarding the evolution of Earth's atmosphere and oceans are i, iii, and iv, making option 'D' the accurate choice. Understanding these processes provides insight into how life and the planet's conditions evolved over billions of years.
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Which of the following statements regarding the evolution of the Earth's atmosphere and oceans is/are correct?i. The early atmosphere was primarily composed of hydrogen and helium, which were largely stripped away by solar winds.ii. Photosynthesis by early life forms significantly decreased the levels of oxygen in the atmosphere.iii. Continuous volcanic eruptions contributed to the addition of gases and water vapor to the atmosphere.iv. The Earth's oceans formed within 500 million years of its formation, primarily through the condensation of water vapor.a) i and iib) i and iiic) ii and ivd) i, iii, and ivCorrect answer is option 'D'. Can you explain this answer?
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Which of the following statements regarding the evolution of the Earth's atmosphere and oceans is/are correct?i. The early atmosphere was primarily composed of hydrogen and helium, which were largely stripped away by solar winds.ii. Photosynthesis by early life forms significantly decreased the levels of oxygen in the atmosphere.iii. Continuous volcanic eruptions contributed to the addition of gases and water vapor to the atmosphere.iv. The Earth's oceans formed within 500 million years of its formation, primarily through the condensation of water vapor.a) i and iib) i and iiic) ii and ivd) i, iii, and ivCorrect answer is option 'D'. Can you explain this answer? for Humanities/Arts 2024 is part of Humanities/Arts preparation. The Question and answers have been prepared according to the Humanities/Arts exam syllabus. Information about Which of the following statements regarding the evolution of the Earth's atmosphere and oceans is/are correct?i. The early atmosphere was primarily composed of hydrogen and helium, which were largely stripped away by solar winds.ii. Photosynthesis by early life forms significantly decreased the levels of oxygen in the atmosphere.iii. Continuous volcanic eruptions contributed to the addition of gases and water vapor to the atmosphere.iv. The Earth's oceans formed within 500 million years of its formation, primarily through the condensation of water vapor.a) i and iib) i and iiic) ii and ivd) i, iii, and ivCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Humanities/Arts 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements regarding the evolution of the Earth's atmosphere and oceans is/are correct?i. The early atmosphere was primarily composed of hydrogen and helium, which were largely stripped away by solar winds.ii. Photosynthesis by early life forms significantly decreased the levels of oxygen in the atmosphere.iii. Continuous volcanic eruptions contributed to the addition of gases and water vapor to the atmosphere.iv. The Earth's oceans formed within 500 million years of its formation, primarily through the condensation of water vapor.a) i and iib) i and iiic) ii and ivd) i, iii, and ivCorrect answer is option 'D'. Can you explain this answer?.
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