Very short answer questions I — task. Science State Board, Class 7.

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1. State two examples of periodic changes.

Occurrence of a thunderstorm
Seasonal changes
Motion of hands of a clock
Pounding silver into thin plate
Formation of eclipses

2. Mention any two exothermic reactions.

Sublimation
Vaporization of water
Burning of magnesium ribbon
Burning of a candle

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