- Abrasion changes rocks from rough into smooth and round
- Abrasion is a kind of weathering
- So, abrasion is the kind of weathering that would change the rocks from rough into smooth and rough

Therefore, abrasion is the kind of weathering that would change the rocks from rough into smooth and rough
Q: A group of students is taking a hike along a stream channel. One student picks up a rock from the stream and notices that the rock is very smooth and round. Which type of weathering most likely shaped the rock?
Context:
- Abrasion changes rocks from rough into smooth and round 
- Abrasion is a kind of weathering