You are presented with the quiz "Streams may start with runoff seeping out of water containing what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "streams may start with runoff or water seeping out of a spring" and "sulfur occurs native in the vicinity of volcanoes and hot springs". 

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


 

      Sulfur     