The main points for an informative speech about the major kinds of fireworks are: I. Skyrockets explode high in the air, producing the most dramatic effects of all fireworks. II. Roman candles shoot out separate groups of sparks and colored flames with a series of booming noises. III. Pinwheels throw off sparks and flames as they whirl on the end of a stick. IV. Lenses are thin, colorful fireworks used in ground displays. These main points are organized in order. spatial descriptive chronological illustrative topical