materials - a substance; what something is made of, flammable - capable of being set on fire and burning very quickly, toxic - poisonous; very harmful if eaten, warning - something that tells people about possible danger, hazardous - dangerous; risky, precaution - something that is done to stop an accident in the future, symbol - a picture that represents something, corrosive - capable of damaging and destroying something through a chemical reaction, reduce - to make something smaller or less, label - a piece of paper attached to something to give more information about it, explosive - capable of causing an explosion; capable of causing a big, dangerous reaction, identify - to know or find out what something is,

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