Final answer:
In detonating cord blasting, a downline connects the detonator to the trunkline, a branchline extends from the trunkline to individual charges, and a trunkline is the main line that synchronizes the blast.
Step-by-step explanation:
In detonating cord blasting, a downline refers to a segment of detonating cord that connects the blasting cap or detonator to the main trunkline. It is often used to initiate the explosion from a remote distance, ensuring safety for those conducting the blast. A branchline is a segment of detonating cord that extends from the main trunkline to individual charges. It diverges from the trunkline to deliver the detonation signal to separate explosive charges. The trunkline, on the other hand, is the main line of detonating cord that runs through the blasting site. It connects multiple branchlines and is a key component in ensuring the coordination and timing of the overall blast by synchronizing the detonation of separate charges.