Which of the following describes a single pellet of pyrotechnic composition that is propelled into the air and can be designed to split apart?

A single pellet of pyrotechnic composition that is propelled into the air and has the capability to split apart is referred to as a comet. Comets are specifically designed to be launched skyward, and as they ascend, they can break into multiple components, creating a visually appealing display in the sky. This characteristic of splitting apart distinguishes comets from other pyrotechnic devices, which may not have the same aerial propulsion or fragmentation features.

In contrast, mines detonate at ground level and do not ascend like comets. Fusees are more of a signaling device and are not typically used for aerial displays. Ground display pieces remain on the ground and do not achieve the aerial effect that comets do. Understanding these distinctions is essential for recognizing the specific roles and behaviors of different pyrotechnic devices in fireworks displays.