Difficulty: Hard

Average Score: 33%

Which question would be appropriate for an observational study?

Rationale

What types of rocks are found at a convergent boundary?

Observational studies aim to observe and describe phenomena without manipulating variables. This question pertains to the types of rocks present at a geological feature, allowing researchers to gather data through observation and analysis of existing samples rather than conducting experiments.

A (Which type of metal conducts electricity best?) YOUR ANSWER

This question implies a comparative experiment, as it suggests testing various metals under controlled conditions to measure their electrical conductivity. Such an approach necessitates the manipulation of variables, which is contrary to the nature of observational studies.

B (Does adding salt to water affect how fast the water evaporates?) YOUR ANSWER

This question is experimental in nature, as it involves manipulating the variable of salt concentration to observe its effect on evaporation rates. The need for controlled conditions and measurement of outcomes makes it unsuitable for an observational study.

C (What types of rocks are found at a convergent boundary?) CORRECT

This question is ideal for an observational study since it focuses on examining and categorizing existing rock types at a specific geological location. Researchers can collect rock samples and analyze their characteristics without altering the environment, aligning perfectly with the observational study methodology.

D (How does the mass of an object affect the strength of its gravitational field?) YOUR ANSWER

This question suggests a relationship that would typically require experimental manipulation to determine. Understanding how mass influences gravitational strength involves measuring outcomes based on variable adjustments, thus disqualifying it from being an observational study.

Conclusion

In summary, observational studies are characterized by their focus on describing and analyzing phenomena without experimental manipulation. The question regarding the types of rocks at a convergent boundary exemplifies this approach, allowing for data collection through observation. In contrast, the other options involve experimental designs that require variable manipulation, rendering them inappropriate for observational studies.

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