Answer:
Matels like Gold and Silver
Explanation:
The Sumerians were well known for their metalwork, a craft at which they were excellent. Most of the trading done in Ur (Sumerian city-state) as importing happened here. Imported goods hold valuable metals and semi-precious stones such as gold, silver, carnelian and lapis lazuli. Gold maintained for religious functions as well as in serving as personal ornaments, weapons etc.
1. They can be formed bcause of events
2. Cities can also grow on rivers to help grow the poupulation
Key was inspired by the sight of a lone U.S. flag still flying over Fort McHenry at daybreak, as reflected in the now-famous words of the “Star-Spangled Banner”: “And the rocket's red glare, the bombs bursting in air, Gave proof through the night that our flag was still there.”
