a basalt column a stalactite a fault line a delta
I gave my students this multiple choice question: During a rainstorm, leaves wash down a gully on a hillside. The water slows down at the foot of the hill and fans out, depositing the leaves. What geologic structure is formed in a similar way?

Only one answer is correct among these 4 choices:
- a basalt column
- a stalactite
- a fault line
- a delta

Could you tell me which one is correct?

a delta