Choose the best answer II — task. Science State Board, Class 7.

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1. __________ is an example of a non-periodic change.

Earthquake
Formation of rainbow in sky
Occurrence of tides in seas
Showering of rain

2. ___________ is not a chemical change.

Dissolution of ammonia in water
Melting of polar ice caps
Dissolution of carbon-di-oxide in water
Dissolution of oxygen in water

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