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Difficulty: MediumRhetorical Synthesis: Summarization and Generalization

While researching the dwarf planet Ceres, a student takes the following notes:
* Ceres is the largest object in the asteroid belt between Mars and Jupiter.
* In 20152015, NASA’s *Dawn* spacecraft arrived at Ceres to analyze its surface composition and geology.
* *Dawn* detected abundant water ice and organic compounds mixed with clay minerals on Ceres's surface.
* The spacecraft also discovered bright spots in Occator Crater, which were identified as sodium carbonate deposits left behind by evaporated salty water.
* These findings suggest that Ceres once had a global ocean and may have been geologically active in its recent past.

The student wants to summarize the findings of NASA's *Dawn* spacecraft mission. Which choice most effectively uses information from the given notes to accomplish this goal?

  1. By detecting water ice, organic compounds, and sodium carbonate deposits on the surface of Ceres, NASA's *Dawn* spacecraft revealed evidence suggesting the dwarf planet once possessed a global ocean.Answer
  2. B
    NASA's *Dawn* spacecraft arrived at Ceres in 20152015, focusing its geological analysis on the bright spots within the Occator Crater.
  3. C
    Ceres, the largest object in the asteroid belt between Mars and Jupiter, was determined by the *Dawn* spacecraft to be currently geologically active.
  4. D
    NASA's *Dawn* spacecraft confirmed that all objects in the asteroid belt contain abundant water ice and organic compounds mixed with clay minerals.

Answer

The choice stating that NASA's *Dawn* spacecraft detected water ice, organic compounds, and sodium carbonate deposits on Ceres, suggesting a past global ocean, is the correct summary.
The correct answer effectively summarizes the main discoveries of NASA's *Dawn* spacecraft (water ice, organic compounds, and sodium carbonate deposits) along with their primary implication (that Ceres may have once possessed a global ocean). This accurately covers the core scientific findings of the mission described in the notes.

Step-by-Step Solution

1
Identify the student's rhetorical goal.
The goal is to summarize the findings of NASA's *Dawn* spacecraft mission.
The prompt specifically directs the student to identify a choice that summarizes the mission's findings.
2
Analyze the notes for key discoveries and their scientific implications.
The notes state that *Dawn* detected water ice, organic compounds, and sodium carbonate deposits, which suggest that Ceres once had a global ocean.
Summarizing the findings requires combining the concrete evidence discovered with the overall conclusion drawn from that evidence.
3
Evaluate the options to determine which one accurately synthesizes these points without misrepresentation or overcomplication.
The option beginning with 'By detecting water ice...' is the only choice that encapsulates both the specific surface materials found and the overall hypothesis of a past global ocean.
Other options either focus too narrowly on details of the spacecraft's journey, misrepresent the certainty and timing of geological activity, or make unwarranted assumptions about all asteroids.

Key Concept

Rhetorical Synthesis: Summarization and Generalization
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Rhetorical Synthesis: Summarization and Generalization

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