The civilized life that emerged at Sumer was shaped by two conflicting factors: the unpredictability of the Tigris and Euphrates rivers, which at any time could unleash devastating floods that wiped out entire peoples, and the extreme richness of the river valleys, caused by centuries-old deposits of soil.
(The civilized life; emerged; L:at Sumer) (The civilized life that emerged at Sumer; was shaped; by two conflicting factors: the unpredictability of the Tigris and Euphrates rivers, which at any time could unleash devastating floods that wiped out entire peoples, and the extreme richness of the river valleys) (the unpredictability of the Tigris and Euphrates rivers; could unleash; devastating floods that wiped out entire peoples; T:at any time) (devastating floods; wiped out; entire peoples) (the river valleys; caused; by centuries-old deposits of soil)
The civilized life The civilized life that emerged at Sumer the unpredictability of the Tigris and Euphrates rivers devastating floods the river valleys
emerged was shaped could unleash wiped out caused
L:at Sumer
by two conflicting factors: the unpredictability of the Tigris and Euphrates rivers, which at any time could unleash devastating floods that wiped out entire peoples, and the extreme richness of the river valleys
devastating floods that wiped out entire peoples T:at any time
entire peoples
by centuries-old deposits of soil