How does a bering land bridge form?

During the Ice Age, when the water level dropped and the ocean froze around the Arctic, the Bering Land Bridge (Beringia) formed between Alaska and Russia.

I'm hella smart but i dont know that

The zhou dynasty (1046-256 bce) was the longest-lasting of china's dynasties. it followed the shang dynasty (c. 1600-1046 bce) and it finished when the army of the state of qin captured the city of chengzhou in 256 bce.