The following sentences are from a draft of an essay about seismologist Inge Lehmann. To ensure that the paragraph develops its claim logically, in what order should these sentences be arranged?
- 1In 1936, seismologist Inge Lehmann proposed that the Earth’s core was not entirely liquid, but instead contained a solid inner core.
- 2She based this proposal on her analysis of seismic wave readings recorded after a major earthquake near New Zealand.
- 3Lehmann observed that certain P-waves, which were expected to be deflected by a liquid core, actually passed directly through the center of the Earth.
- 4The path of these waves could only be explained if they were bouncing off a dense, solid boundary at the very center of the planet.
Answer
The paragraph should start with the sentence proposing the solid inner core, followed by the sentence explaining the earthquake data source, then the sentence detailing the specific P-wave observations, and conclude with the sentence explaining how these wave paths prove the solid boundary.
The correct order begins by stating the main claim (Lehmann's proposal of a solid inner core). It then transitions to the source of her data ('this proposal' based on the New Zealand earthquake), details the specific evidence observed in that data (P-waves passing through the center), and concludes by explaining why this wave behavior proves the solid core.
Step-by-Step Solution
Key Concept
Supporting Claims with Evidence and Details
Estimated Time:1m 0s