The answer is a decrease in the usability of soil for agriculture.
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He's organizing history by continent
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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As a result of the Iranian Revolution, the pro-American government of the Iranian Shah Reza Pahlavi, was replaced by the more extreme religious theocracy led by Ayatollah Khomeni. The transition included the takeover of the U.S. Embassy in Teheran and the seizure of more than 40 U.S. hostages. The United States subsequently cut off diplomatic relations with the Iranians for a number of years.
