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Matter undergoes certain changes as a result of the application of energy. Glaciers melt in summer and rivers freeze in winter. Water from saltpans on the sea coast dry up, leaving behind salt. Water from the sea evaporates to from water vapour, which form into clouds and then condense to form rain. A candle upon burning gives light, heat, water vapour and carbon dioxide. Hydrogen burns in air to form water.
The different changes that matter undergoes, may be broadly classified into PHYSICAL and CHEMICAL changes.
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