a raindrop splashing in a lake a snowball rolling down a mountain a river washing away soil from its bank a tree root growing into the crack of a rock
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Weathering causes rocks and minerals to break into smaller pieces. Which event is the best example of weathering?
Possibilities:
- a raindrop splashing in a lake
- a snowball rolling down a mountain
- a river washing away soil from its bank
- a tree root growing into the crack of a rock

a tree root growing into the crack of a rock