Final answer:
Mendelssohn presents 'storm' passages in the piece through rapid shifts in tempo and dynamic intensity.
Step-by-step explanation:
Mendelssohn presents 'storm' passages in the piece through rapid shifts in tempo and dynamic intensity. By altering the speed and volume of the music, Mendelssohn is able to capture the intense and unpredictable nature of a storm. This technique creates a sense of tension and excitement for the listener.