When there is a fire, aim the fire extinguisher __________ the fire and use a sweeping motion until the fire is extinguished.

Aiming the fire extinguisher at the base of the fire is essential because that is where the fuel source is located. Fires need fuel to continue burning, and targeting the base allows the extinguisher's contents to effectively smother the flames and interrupt the combustion process. By using a sweeping motion at the base, you can cover the entire area that is on fire, ensuring that the extinguisher is working to eliminate the heat and fuel, which are necessary components for maintaining the fire. Aiming at the base also helps prevent the flames from spreading upward, where they can catch additional materials on fire.