🔍 Key Concepts

• Spontaneous combustion happens without an external flame or spark • Materials that can self-heat when left piled up, especially when contaminated with oil or chemicals • The role of improper disposal and storage of waste materials on board

💭 Think About

• Which of these choices can slowly heat up by themselves when piled together, even without a flame? • On vessels and in industrial settings, what specific type of waste is always warned about for spontaneous heating and fire risk? • Which option is more about a continuing ignition source (like a flame or ember) rather than something that can self-ignite over time?

✅ Before You Answer

• Identify which material can undergo self-heating through oxidation when bunched up • Eliminate options that require an obvious open flame or ember at the start • Think about standard safety warnings regarding waste disposal on board ships and what must be stored in covered metal containers