Question 140·Hard·Rhetorical Synthesis
While researching a topic, a student has taken the following notes:
- Ground-penetrating radar (GPR) sends high-frequency radio waves into the ground; reflections from boundaries between materials can reveal buried walls, foundations, and pipes.
- Magnetometry measures subtle variations in Earth’s magnetic field; features such as fired clay, hearths, and filled-in ditches can register as magnetic anomalies.
- Both techniques allow archaeologists to map subsurface features without excavation.
- GPR effectiveness can be reduced in clay-rich or water-saturated soils.
- Magnetometry readings can be disrupted by nearby metallic objects and power lines.
- Archaeologists often deploy both techniques together to obtain complementary data.
The student wants to emphasize a similarity between GPR and magnetometry. Which choice most effectively uses relevant information from the notes to accomplish this goal?
For rhetorical synthesis questions based on notes, first underline the task word or phrase in the question (such as emphasize a similarity, explain a difference, or show a cause-and-effect). Then scan the notes specifically for the bullet or bullets that match that task, paying attention to signal words like both, however, or because. Finally, choose the answer that directly and accurately reflects the targeted information from the notes and matches the purpose stated in the question, eliminating any options that are true but focus on the wrong relationship (like differences or extra details).
Hints
Focus on the key instruction
Pay close attention to the phrase "emphasize a similarity" in the question. What kind of information should you be looking for in the notes if you want to show that two things are alike?
Find the relevant note
Look back at the bullet points and find the one that talks about both ground-penetrating radar and magnetometry in the same sentence.
Eliminate mismatched choices
As you review the answer choices, cross out any that mainly describe differences, problems with one method, or how the methods are used together instead of what they have in common.
Step-by-step Explanation
Identify the task in the question
The question says the student wants to "emphasize a similarity" between ground-penetrating radar (GPR) and magnetometry. That means the correct answer must describe something they have in common, not how they differ, where they fail, or how they are used together.
Look for similarity information in the notes
Scan the notes for any bullet that talks about both GPR and magnetometry at the same time. One bullet clearly begins by mentioning both techniques together and describes what they both enable archaeologists to do.
Compare each answer choice to the goal
Now check each option against the requirement to emphasize a similarity:
- One option contrasts what each tool measures, highlighting a difference.
- Another explains when archaeologists might choose one technique over the other, focusing on conditions and preferences.
- Another states that archaeologists often use the two techniques together, which is about practice, not necessarily a shared feature.
- Only one option directly states a shared ability that both techniques provide.
Select the choice that expresses the shared ability
The bullet in the notes that covers both techniques says they allow archaeologists to map subsurface features without digging. Choice C, "Both ground-penetrating radar and magnetometry allow archaeologists to map buried features without excavation," restates this shared function and clearly emphasizes a similarity, so C is the correct answer.