A hazard is a potential source of harm that can cause damage to health, life, property, or any other interest of value. Hazards can be classified in several ways, such as natural, anthropogenic, technological, or any combination. Hazards can be dangerous phenomena, substances, human activities, or conditions that may cause loss of life, injury, or other health impacts, property damage, loss of livelihoods and services, social and economic disruption, or environmental damage. Hazards can be classified by the populations that may be affected and the severity of the potential harm. Hazards can be single, sequential, or combined in their origin and effects. Hazards can be characterized by their location, intensity, or magnitude. Hazards can be associated with stored energy that, when released, can cause damage, and the stored energy can occur in many forms, such as chemical, mechanical, and thermal hazards.