1. Notice 15 changes around you and classify them as physical change, chemical change, slow change,fast change, desirable change, undesirable change, reversible change, irreversible change, periodic change and non-periodic change.
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INTRODUCTION
In our daily life, we observe many changes around us. Everything in this universe undergoes a change. These changes may be observed by us at school, home, playground, garden or any other place. For example, sudden change in weather, flowering of plants, melting of ice, ripening of fruits, drying of clothes, milk changing into curd, germination of seeds, cooking of food, rusting of iron, bursting of firecrackers etc., are the common changes that occur in day-to-day life.
The changes can bring about different kinds of alterations in the things around us. Some of the alterations brought about are permanent in nature, and hence, cannot be reversed. However, some alterations are brought about in position, shape, size or state of the things. These alterations are temporary in nature, and hence, can be reversed.
Classification Of Changes
The changes taking place around us can be classified as under :
(1) Slow and fast changes.
(2) Reversible and irreversible changes.
(3) Desirable and undesirable changes.
(4) Periodic and non-periodic changes.
(5) Physical and chemical changes
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