You are presented with the quiz "Deltas are formed by deposition of what at the mouth of a river by water fanning out?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "adelta is formed by deposition of sediment at the mouth of a river by water fanning out" and "sand is an example of a clastic sediment". 

So, what's the best answer to the question?


 

      sand     