Describe two changes that are harmful Explain why you consider them harmful How can you prevent them - Science - Physical and Chemical Changes

Question

Describe two changes that are harmful Explain why you consider
them harmful How can you prevent them ?

Naveen Rawat · Accepted Answer

Rusting of iron and Burning of wood are to harmful changes
Rusting of iron:
Every year, our world suffers huge monetary losses owing
to the process of rusting, which causes harm to the articles made
of iron
Prevention:Painting or coating iron articles with grease:
This does not allow iron to come in contact with oxygen and water
Hence, it prevents rusting In fact, paints and grease should be
applied regularly to prevent rusting
Burning of wood:
Burning of wood produces large amount of harmful gases that
pollute our environment and cause Green House Effect ( rise in
temperature of earth)
Prevention: Use of cleaner fuel like LPG,CNG and Bio-fuel
etc

Describe two changes that are harmful. Explain why you consider them harmful .How can you prevent them ?