Final answer:
The blank word that completes the list of three main atmospheric hazards that cause concern is flammability.
Step-by-step explanation:
The blank word that completes the list of three main atmospheric hazards that cause concern is flammability.
The three main atmospheric hazards are oxygen depletion, flammability, and the blank word that causes concern. Flammability refers to the ability of a substance to catch fire or burn.
In the context of atmospheric hazards, it means the potential for substances in the atmosphere to ignite and cause fires or explosions.