Describe two changes that are harmful. Explain why you consider them harmful how can you prevent them.
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Rusting of iron: If bicycle's chain gets rusted it may result in the breakage of it.
Prevention: Coating the iron surface with grease.
Melting of glacier (physical change): It may result in the rise of ocean level resulting in the submerging of islands and coastal areas.
Prevention: Reducing the emissions of green house gases.
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