③ Indicate whether each of the following changes
is slow or fast ; reversible or irreversible change ; periodic or non - periodic change ; physical or chemical change ; desirable or undesirable change :
1. Drifferent 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 leaves in a pit.
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1. periodic change
2. fast change
3. desirable change
4. irreversible change, chemical change
5. desirable change
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