The correct answer to this open question is the following.
Sumerians believed that the gods could bring a good harvest or a terrible flood.
Sumer is the oldest civilization known to man. It was established between the Tigris and Euphrates Rivers in the Middle East Region. They developed important city-states such as Kish, Ur, Uruk or Lagash, where the built great temples called Ziggurats to honor their gods. Sumerians were religious people that respected their gods because they believed that the anger of the gods could produce floods and catastrophes, as well as the goodwill of the gods, could produce a good harvest.