3rd December 2019

scientificamerican
14

When did the natives cross the land bridge?

The theory that the Americas were populated by humans crossing from Siberia to Alaska across a land bridge was first proposed as far back as 1590, and has been generally accepted since the 1930s.

Hereof, why is the Bering land bridge so important?

Lowered sea levels during the last Ice Age exposed dry land between Asia and the Americas, creating the Bering Land Bridge. The first humans to arrive in America came from Asia across the land bridge, but when and how they spread throughout the New World is still a mystery.

What is the land bridge and why it happened?

As the ice age waned, glaciers began melting and sea levels around the world began rising. By about 10,500 years BP, the Bering Land Bridge had disappeared, and the continents of North America and Asia were once again separated by the waters of the Bering Strait and Chukchi Sea.

When did the land bridge disappear?

That exposed the broad continental shelves now covered by the Bering Strait and created the land bridge. The bridge last arose around 70,000 years ago. For years, scientists thought it disappeared beneath the waves about 14,500 years ago, toward the end of the last ice age.