Final answer:
Nearby structures and vegetation can be ignited if air currents carry hot fire brands or embers aloft.
Step-by-step explanation:
Nearby structures and vegetation can be ignited if air currents carry hot fire brands or embers aloft. When strong winds blow during a fire, burning embers can be carried through the air and land on nearby structures or vegetation, causing them to catch fire. This is why it's important to take precautions to protect buildings and clear vegetation around them in fire-prone areas.