Indicate whether each of the following changes is slow or fast ; reversible or irreversible ; desirable or undesirable ; period or not periodic ; and physical or chemical :
1- Different phases of moon.
2- Lighting in the sky.
3- Formation of biogas from cow dung.
4- Combustion of petrol in an automobile engine.
5- Formation of manure from dry while lives in a pit.
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1. slow change , reversible change and periodic change
2. fast change
3.chemical change
4. chemical change
5. physical change
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