(1) Conversion of milk into yoghurt.
(2) Bursting of a cracker.
(3) Occurrence of an earthquake.
(4) Revolution of the earth around the sun
(5) Stretching of a spring
opening a zip of bag
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Note: You haven't noted what is to be done but by the glance at the type of examples, I think it is to state which of these are Physical or Chemical changes.
Answer:
1) Chemical Change
2) Chemical Change
3) Physical Change (Since they occur by the movement in tectonic plates, which doesn't form a new substance nor causes any reaction)
4) Periodic Change
5) Physical Change
6) Physical Change
Hope this helps...
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