Concept:Sequence of sentences must maintain logical coherence between S1 and S6.
Explanation:S1 introduces the relationship between meteorology and climatology.
Sentence S defines meteorology as the physics of the lower atmosphere, which naturally follows S1.
Sentence P begins with “In other words,” so it must come immediately after S to restate the definition of meteorology.
Next, sentence R starts with “On the other hand,” which contrasts climatology with the previously described meteorology. Thus, R follows P.
Finally, sentence Q states that the function of climatology is two‑fold. This directly leads into S6, which lists the two aspects (first and second).
Therefore, the correct order is S, P, R, Q, which matches option SPRQ.
Answer:SPRQ