Final answer:
The pictogram description correctly paired with the hazard it represents is a metal railroad tie being cut with the flame of an acetylene torch as a fire hazard, and a chemical cold pack containing ammonium nitrate as a health hazard.
Step-by-step explanation:
The pictogram description correctly paired with the hazard it represents is:
- Picture a: Metal railroad tie being cut with the flame of an acetylene torch - Fire hazard
- Picture b: Chemical cold pack containing ammonium nitrate - Health hazard
The National Fire Protection Agency (NFPA) 704 Hazard Identification System uses a diamond symbol to indicate the level of fire hazard, health hazard, reactivity hazard, and special hazards of a substance. Each hazard is rated on a scale from 0 to 4, with 0 being no hazard and 4 being extremely hazardous.