1) It considered useful when it serves its purpose or even beyond? 2) Material that are made of certain purpose only and can cause injury when not used or dispose properly. 3) Give 5 examples of Useful materials 4) Give 5 examples of Harmful materials 5) When is a material considered waste? 6) A material can no longer be used after it has served its purpose? 7) Examples of waste materials 8) It s a dumping site where waste materials are covered with layers of soil so as not to pollute the surrounding land. 9) Why are landfill sites so harmful to the environment? 10) A material can still be reused for other purposes helps us minimize wastes?

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