Final answer:
When creating a fire line, the action that would be done is to scatter all unburned material into the black.
Step-by-step explanation:
When creating a fire line, the action that would be done is to scatter all unburned material into the black. This means that any unburned vegetation or fuel that is in the path of the fire line should be spread out and moved away from the burning area. This helps to prevent the fire from spreading further by removing potential fuel sources.