Many scientists believe that the land bridge theory explains

• how people first migrated to North America.

• where the earliest Americans found boat-building material.

• why the Ice Age delayed migration to South America.

• why North America experienced an Ice Age.

Which of the following theories states that humans first migrated to America by boat?

• the coastal crossing theory

• the land bridge theory

• the Ice Age theory

• the Asia theory

The land bridge and coastal crossing theories concern the earliest human migration from

• Asia to South America.

• South America to Asia.

• Asia to North America.

• North America to Asia.

Why is the coastal crossing theory of migration hard to prove or disprove?

• There are many early human sites that provide clues about migration.

• The coastlines that migrants would have sailed along are underwater.

• Sea levels have lowered since the Ice Age.

• The climate has remained the same since the Ice Age.

One similarity between the land bridge and coastal crossing theories of migration is that

• both stress the use of boats in migration.

• neither point out how easy it was for migrants to find food.

• both state that migrants used the land bridge to migrate.

• neither are taken seriously by archaeologists.

Which statement would most likely appear in an essay about the land bridge theory of migration?

• Many who crossed the bridge wrote about the experience.

• Sea levels fell during the most recent Ice Age.

• A mild climate encouraged hunter-gatherers to travel.

• Animals were unable to live on the land bridge.

Which term most precisely names the earliest culture to develop in North America?

• the Folsom

• the Plano

• the Paleo-Indians

• the Clovis

What helps archaeologists see connections among Clovis sites?

• similar metal tools

• similar buildings

• similar tools and remains

• similar locations and climates

Which of the following is most useful in identifying sites left by the Clovis?

• the remains of buildings

• animal hides

• flaked stone points

• weapons made from bones

Which of the following best describes where Clovis artifacts are generally found?

• above ground

• in caves

• underwater

• deep underground