This document provides a chart summarizing dangerous goods classes and their associated hazards and immediate actions. It lists 10 classes of dangerous goods including explosives, gases, flammable liquids and solids, oxidizers, toxins, radioactive materials and corrosives. For each class, it describes the hazard such as fire, explosion or toxicity risks. It also provides immediate action steps to minimize leakage, contact with other cargo, notify authorities and take other protective measures depending on the material.