Answer:
Both are only physical changes.
Explanation:
The green stuff is cupric chloride, a byproduct of corrosion of the valve body or possible copper leachate in the water. Either way, it's typical of water leakage where the water is of low pH. Boiling sugar to make caramel is the same as eating sugar, just in a different form.
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Success in trade always deals with advertisement. In this case, the spread of Islam help distribute it's teachings and beliefs making more people contribute to trade.
Ports in major cities where they will be sent to work.
