Logical ReasoningDifficulty: Easy

PT155 S2 Q6 ExplanationSaturn’s moon Enceladus has

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsMain Conclusion

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Stimulus

Saturn’s moon Enceladus has a rocky core and an icy surface. Between these two layers, there must be a lake of liquid water. The Cassini space probe was used to measure the density of matter composing Enceladus. These measurements revealed something denser of Enceladus, and that could only be liquid water.

What this question is testing

Main Conclusion

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
6.

Which one of the following most accurately expresses the overall conclusion drawn

Answer choices, explained

  1. Background Fact1% picked this

    Saturn’s moon Enceladus has a rocky core and an

    This is the 1st sentence. We're looking for an answer that says the 2nd sentence. The fact that this sentence is presented as fact means that it would not be our author's Main Conclusion, which will be an opinion.

  2. Correct89% picked this

    There must be a lake of liquid water between the rocky core and the icy

    Why this is right

    This paraphrases the 2nd sentence.

    Skill tested: Main Conclusion · how this choice captures the argument's function is the move to repeat next time.

  3. Background Fact0% picked this

    The Cassini space probe was used to measure the density

    This is the 3rd claim. We're looking for an answer that says the 2nd sentence. Also, the fact that this claim is presented as fact means that it would not be our author's Main Conclusion, which will be an opinion.

  4. Premise1% picked this

    Density measurements reveal something denser than ice between the core and

    This is the 4th claim, appearing in the 3rd sentence. We're looking for an answer that says the 2nd sentence. The fact that this sentence is a measurement, thus a fact, means that it would not be our author's Main Conclusion, which will be an opinion.

  5. Premise Last-Claim Trap9% picked this

    Anything denser than ice between the core and surface of Enceladus would have to

    This is the final claim, which will not be where we find the Conclusion on most Main Conclusion questions. The conclusion was the 2nd sentence. This is a premise, which we can surmise because it's prefaced by the word "and", which almost always connects two supporting ideas. We can also tell it's not the conclusion, because no support is offered for it. Why should we believe that anything denser than ice would have to be liquid water? They didn't ever support that idea, so it can't be a conclusion.

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