You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Sentence: Suppose you look into the sky. Question: Which star is easier to see?
Sirius

Sentence: Naomi heard two cats meowing. One was closer to her and the other was farther away. Question: Which cat sounded louder?
closer cat

Sentence: Franklin found that if he slides a turtle on its back across a pool table, it slides farther than if he were to slide the turtle across a pile of leaves. He realizes this because there is less resistance on the pool table. Question: The difference in the length that the turtle slides across both surfaces can be attributed to which surface being rougher?

pile of leaves