Answer:
Some of the best specimens of petrified wood have been preserved by silicification. Two forms of silicification are common. The most abundant is wood that has been replaced and infilled by chalcedony (sometimes called "agatized wood").
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Explanation:
I believe that is the river Euphrates, the river Tigris is number 7, and 8 is the Persian gulf.
What statements? I can say, a clergy is a religious person (christian).
