Additional Activities Directions: Fill out the Venn Diagram below with similarities and differences between mechanical and electromagnetic waves. Use the labelled circles for the terras that relate to mechanical and electromagnetic waves individually. Identify the terms that relate to both the two classifications of waves on the overlap. Copy and write your answer on a separate sheet of paper. Types of waves Needs medium to propagate Sound wave Ultraviolet ray Periodic disturbance Does not need medium to propagate​