The water cycle ensure that we have water available by contributing to the amount freshwater available for use for the living organisms. We can get water from lakes and from underground water.
The people of Sumer practiced "polytheism" which is the worship of many gods. Polytheism was in fact quite common during this time since it helped explain why the world functioned the way it did.
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I believe it was John C. Frémont
Correct me if im wrong☺