Question

Describe two changes that are harmful how can u prevent ir

Answer 1

Hey mate......^_^

Here's ur ans . ⤵

===============

The two changes that may be harmful are ⬇

✡ MELTING OF GLACIER (Physical Change ) --- It may result in the increasing of ocean level which would create result in submerging of coastal areas and islands

↪ Prevention --- Reducing the emissions of green house gas.


--------------------


✡ RUSTING OF IRON --- If bicycle's chain get rusted it may result in breakage of it.

↪ Prevention --- Apply grease regularly .

Or painting , oiling or galvanising can also done

______________________

✌Hope it helps

Answer 2

Hey Bud!

The two changes that are harmful =is mentioned with the ways how to prevent it-

1. The spoiling of the food- as if a food item is kept for many days then it may be very poisonous and would also cause several diseases if eaten.

How to prevent it-:
- By keeping it with some preservatives
- By keeping it in a refrigirator

2. The rusting of the iron- It may destroy the whole thing and will also discolor it and will make it look old.

How to prevent it-:
- By applying grease
- By painting it
- By oiling it
- By the process of galvanization

Hope it helps!