explain the following terms with example
1)periodic change
2)desirable change
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1)- Changes which occur after a particular interval of time, is called periodic change.
Examples --> 1)- Phases of moon
2)- Simple pendulum
2)- Changes which are desirable for everyone, is called desirable change.
Examples -->1)- Afforestation
2)- Non - pollution activities
Examples --> 1)- Phases of moon
2)- Simple pendulum
2)- Changes which are desirable for everyone, is called desirable change.
Examples -->1)- Afforestation
2)- Non - pollution activities
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