Please choose the correct answer to the 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?

Answer1: a basalt column Answer2: a stalactite Answer3: a fault line Answer4: a delta

Answer format: answer1/answer2/answer3/answer4
Answer: answer4