Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.

Steps: (1) Acid rain makes waters acidic (2) Causes them to absorb aluminum from soil (3) Fish and their eggs die (4) Frogs and plants die (5) Insects and other wildlife die (6) The ecosystem is out of balance, causing further problems  
Where does the following step fit into the given list of steps: The water runs off from the soil into lakes, streams, etc 
 After step 2. 