Describe two changes that are harmful. Explain why they considered them harmful. how can you prevent them?
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Two changes which are harmfulare: 1) Rusting of iron - it cancause damage to ships - can beprevented by galvanizing. The two chemical changes which areharmful to us are given below: Rusting on metal objects as itdeteriorates the metal surface and decreases the efficiency ofit.
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- Combustion of petroleum as it cause a threat to the environment.
- Burning of Plastic gives out harmful gasses.
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