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

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1. State two examples of periodic changes.

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

2. Mention any two exothermic reactions.

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

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