Which of these is an example of a physical change?
sugar dissolving in warm water
iron rusting in the presence of moist air
wood burning in the presence of oxygen
baking soda reacting with acid to form a gas

due to huge amount of rocks containing many nutrients and more temperature and pressure due contraction and expansion

Explanation:

and due to pressure volcanic eruption is done and when it cools the nutrients and mixture of metals also cool forming volcanic crystals

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