Detailed Instructions: 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.
Q: Steps: (1) A large rocky area is formed (2) The rocky area has a higher elevation than the surrounding areas (3) Water from precipitation falls in the area (4) The water forms a stream (5) The stream flows towards lower elevation (6) The river continues to flow along the same path for a long time (7) The river erodes the rocky area that it touches (8) The eroded area cuts deeply into the rock.  
Where does the following step fit into the given list of steps: The stream becomes a river 
A:
 After step 5. 