Question

describe two changes that are harmful explain why you consider them harmful how can you prevent them?

Answer 1

1.Rusting Of Iron:If bicycle chain get rusted,it may result in breakage of bicycle chain.

Prevention:Apply grease on it regularly.

2.Burning Of wood:When wood is burnt,it releases harmful gas and pollutes the earth.

Prevention:Use clean fuels like CNG,LPG,etc

Answer 2

two changes which are harmful to you are :

1) when any mineral or strong acid comes in contact with your flesh. this leaves acid burns on your skin as the acid adds heat to your sking, burning it, or in severe cases, dissolving it.

2)if a box jellyfish stings you. the little 'feeler's floating attached to the box jellyfsh contain a dangerous Neurotoxin that can kill you in two minutes, disabling your nervous system and stopping you heart, so you're pretty much dead.