Given the task definition and input, reply with output. 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 leaches aluminum from clay particles in soil (2) Acid rain dissolves minerals and nutrients in soil (3) Washes them away so plants can't benefit from them (4) PH in soil and water gets affected which can kill plants and animals (5) Acid rain in fog at higher elevations can strip foliage off trees.
Where does the following step fit into the given list of steps: Aluminum flows into streams and lakes
After step 1.