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Zorluk: ZorExplicit Detail Retrieval

In evaluating marine sediment cores from the North Atlantic, paleoclimatologist Hélène Gautier analyzed the isotopic ratios of oxygen (δ18O\delta^{18}\text{O}) in benthic foraminifera to reconstruct deep-sea temperature fluctuations during the Mid-Pleistocene Transition. Previous studies postulated that the transition from 41,00041,000-year to 100,000100,000-year glacial cycles was driven exclusively by changes in high-latitude insolation resulting from orbital obliquity. Gautier’s analysis, however, revealed that deep-water cooling preceded the expansion of continental ice sheets by approximately 7,0007,000 years. Furthermore, by cross-referencing trace element ratios of magnesium to calcium (Mg/Ca\text{Mg/Ca}) in the calcite shells of *Cibicidoides wuellerstorfi*, she demonstrated that deep-ocean temperatures dropped by 2.3∘C2.3^\circ\text{C} prior to any measurable increase in global ice volume, indicating that oceanic circulation changes functioned as an active driver rather than a passive response.

According to the passage, Gautier's analysis of benthic foraminifera revealed which of the following regarding the relationship between deep-ocean cooling and continental ice sheet expansion?

  1. A reduction in deep-ocean temperatures occurred prior to the expansion of continental ice masses.Cevap
  2. B
    Continental ice sheets expanded for approximately 7,0007,000 years before any measurable decline in deep-ocean temperatures took place.
  3. C
    Orbital obliquity shifts directly induced a 2.3∘C2.3^\circ\text{C} drop in deep-sea temperatures without influencing high-latitude insolation.
  4. D
    Deep-ocean temperature drops coincided exactly with measurable increases in global ice volume.
  5. E
    Changes in high-latitude insolation actively prevented deep-water cooling during the Mid-Pleistocene Transition.

Cevap

A reduction in deep-ocean temperatures occurred prior to the expansion of continental ice masses.
The passage explicitly states that 'deep-water cooling preceded the expansion of continental ice sheets by approximately 7,0007,000 years' and that ocean temperatures dropped '2.3∘C2.3^\circ\text{C} prior to any measurable increase in global ice volume.' The correct answer directly reflects this explicitly stated factual sequence using accurate paraphrasing.

Adım Adım Çözüm

1
Identify the target detail in the question prompt
The stem asks what Gautier's analysis revealed regarding the relationship between deep-ocean cooling and continental ice sheet expansion.
Explicit detail retrieval requires matching the exact relationship stated in the text.
2
Locate the corresponding sentence in the passage
The text states: 'Gautier’s analysis, however, revealed that deep-water cooling preceded the expansion of continental ice sheets by approximately 7,0007,000 years' and 'deep-ocean temperatures dropped by 2.3∘C2.3^\circ\text{C} prior to any measurable increase in global ice volume.'
Direct text evidence explicitly details the temporal precedence of cooling over ice sheet expansion.
3
Match the explicit fact to the correct option
The choice stating that a reduction in deep-ocean temperatures occurred prior to the expansion of continental ice masses accurately paraphrases the explicit passage detail.
Accurate synonym substitution ('reduction in deep-ocean temperatures' for 'deep-water cooling' and 'prior to' for 'preceded') retains the exact meaning.

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Explicit Detail Retrieval

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