WORLD CIVILIZATION

Detailed explanation-1: -Although agriculture was the chief industry of Sumer, commerce with distant lands also flourished. The Mesopotamian plain was lacking in resources such as metals, timber, stone, and grapevines, so the Sumerians had to trade abroad to get them.

Detailed explanation-2: -4.4 Uncontrolled Water Supply in the River Valley The farmers who moved to Sumer faced many challenges. One of the biggest problems was the uncontrolled water supply.

Detailed explanation-3: -Sumerians built ships that allowed them to travel into the Persian Gulf and trade with other early civilizations, such as the Harappans in northern India. They traded textiles, leather goods, and jewelry for Harappan semi-precious stones, copper, pearls, and ivory.