The Land Bridge Theory

How do many historians believe the first people migrated to the North American continent?

• They walked across a frozen area from the Asian continent.

• They floated across the Pacific Ocean on glaciers that had broken off.

• They came across the Atlantic Ocean from Africa in special ships.

• They followed animal herds from the South American continent.

How do historians believe humans crossed the Landbridge to migrate to North America?

• hey built special boats to sail across the ocean.

• They walked across when the ocean froze, and the sea level dropped.

• They used large animals to pull boats across the ocean.

• They swam across to follow animal herds.

According to the Land Bridge Theory, how did humans get to North America?

• They sailed across the Atlantic Ocean.

• They walked across the Bering Strait.

• They migrated from South America.

• They sailed across the Pacific Ocean.

What happened to the water in the Bering Strait during the Ice Age?

• evaporated into steam

• dried up due to extreme heat

• flooded the whole area

• froze into glaciers

Why did early humans travel across the Land Bridge?

• to increase trade with North America

• to be free to practice new religions

• to follow migrating herds of animals

• to escape diseases in Asia

What most likely caused the formation of the land bridge between North America and Asia?

• higher temperatures across the earth

• lower temperatures across the earth

• the creation of the Rocky Mountains

• the evaporation of the Pacific Ocean

This map represents the Landbridge Theory of migration.

Which letter represents Asia on this map?

• A

• B

• C

• D

How did the Land Bridge impact North America?

• It brought natural resources to the continent.

• It caused the population of the continent to decrease.

• It allowed unique cultures to develop on the continent.

• It protected the continent from invasion.

This map shows a theory about how the first people came to the North American continent.

What theory does this map represent?

• the Evolutionary Theory

• the Mammoth Theory

• the Landbridge Theory

• the Ice Age Theory

Based on this map, how did Native Americans come to America?

• They swam across the ocean.

• They used canoes to sail over water.

• They walked over the dry strait.

• They rode horses over the land.