Final answer:
Civil disturbances and bomb threats are categorized as man made hazards, which are events resulting from human actions that can have significant negative impacts on people, property, and the environment.
Step-by-step explanation:
Civil disturbances and bomb threats are examples of B. Man made hazards. These types of hazards are events that occur due to human actions and can be intentional or accidental. Examples include industrial accidents, wars, terrorist attacks, and civil unrest. They are of concern because they can have devastating effects on people's lives, property, and the environment. Man made hazards can cause disruption to society and can also contribute to environmental disturbances which have long-term effects on ecosystems and human health.