This document discusses different types of disasters including natural disasters like earthquakes, floods, hurricanes and tsunamis as well as man-made disasters such as industrial accidents, acts of terrorism, and nuclear accidents. It notes that natural disasters are unintentional while some man-made disasters like acts of terrorism can be intentional. Hybrid disasters combine natural elements with human acts, like a disease outbreak combined with bioterrorism. The document outlines the health impacts of different disasters and the important roles that nurses can play in disaster preparedness, response, and mitigation.