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Difficulty: HardTransitions: Elaboration and Exemplification

Planetary geologists studying the surface of Mars have identified features that suggest ancient liquid water once flowed there in large quantities. However, determining the precise duration and stability of these ancient water bodies remains a challenge. __________, the discovery of clay minerals and hydrated silica in Jezero Crater indicates that liquid water must have persisted for thousands, if not millions, of years, as these minerals require sustained aqueous alteration to form.

Which choice completes the text with the most logical transition?

  1. Specifically,Answer
  2. B
    Conversely,
  3. C
    Consequently,
  4. D
    Previously,

Answer

Specifically,
The correct answer is 'Specifically,' because it logically introduces a detailed, concrete example of how scientists are addressing the challenge of determining the duration of Martian water. The discovery of specific clay minerals in Jezero Crater serves to elaborate on and exemplify the general topic of investigating the longevity of Mars's ancient aqueous environment.

Step-by-Step Solution

1
Analyze the relationship between the sentences surrounding the blank.
The sentence before the blank states that determining the duration and stability of ancient Martian water bodies is a challenge. The sentence following the blank presents specific evidence (clay minerals in Jezero Crater) that indicates water persisted for a long time, thus showing how that challenge is addressed.
Identifying the logical flow is crucial to selecting the correct transition category.
2
Determine the required transition type.
Since the second sentence provides a detailed, specific instance or elaboration of the general difficulty discussed in the first sentence, an elaboration or exemplification transition is needed.
The connection is illustrative rather than contrasting, causal, or sequential.
3
Evaluate the choices against this transition type.
Only 'Specifically,' functions as an elaboration transition. 'Conversely,' indicates contrast; 'Consequently,' indicates cause-and-effect; 'Previously,' indicates chronology.
Eliminating options from incorrect logical categories leaves the only suitable fit.

Key Concept

Selecting transition words that signal elaboration or exemplification to logically connect ideas.
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Topics

Transitions: Elaboration and Exemplification

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