What was the artic land bridge over which early nomads traveled from Asia to America

its call Beringia and it was a large expanse of ice that allowed the nomads to cross the ocean by walking.

Explanation:

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.