Final answer:
The use of a shield between an excavation side and the work area is a safety practice to minimize risks from cave-ins during excavation work.
Step-by-step explanation:
Placing a shield between the side of an excavation and the work area is a safety measure that can minimize the risk in the event of a cave-in.
This method, commonly known as trench shielding or using a trench box, involves the use of strong metal or other material barriers that are designed to withstand the pressure from the surrounding soil and provide a safe workspace for workers. These shields are critical in preventing the sides of the excavation from collapsing, which can trap workers and lead to serious injuries or fatalities.