Question

Give scientific reason for the following:
1. Melting of wax is a reversible change.
2. Rotation of the Earth is a periodic change.
3. Cooked food is stored in refrigerator.
4. Floods in river is a undesirable change.​

Answer 1

Answer:

Explanation:

1. As wax can be again converted into solid and can be used again

Also no new products are formed

No chemical reaction takes place

These are the reasons why melting of wax is a reversible change

2.periodic motion refers to the motion that gets repeated in a certain time interval. Earth complete it's rotation in every 24 hours it is called a periodic motion.