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LAND BRIDGE THEORY

LAND BRIDGE THEORY. 1. Theory= an assumption, based on limited information, used to explain an event. 2. Glaciers= thick sheets of ice. (Covered the earth 100,000 -10,000 years ago). LAND BRIDGE THEORY. How did a land bridge form?

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LAND BRIDGE THEORY

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  1. LAND BRIDGE THEORY 1. Theory= an assumption, based on limited information, used to explain an event. 2. Glaciers= thick sheets of ice. (Covered the earth 100,000 -10,000 years ago).

  2. LAND BRIDGE THEORY How did a land bridge form? 3. A land bridge formed because glaciers locked-up water from the sea, exposing land.

  3. LAND BRIDGE THEORY 4. The Beringia land bridge connected northern Asia to Alaska. Today the land is under the Bering Strait. 5. Migrate= to move from one place or region to another.

  4. LAND BRIDGE THEORY

  5. LAND BRIDGE THEORY 6. Scientists feel the first Americans migrated across the land bridge because they followed herds of bison, mammoth and other game.

  6. LAND BRIDGE THEORY 7. The first Americans arrived in the Americas about 30,000 to 15,000 years ago. 8. The directions that the first Americans migrated in were east and south.

  7. LAND BRIDGE THEORY The First American - 12,500 years ago

  8. LAND BRIDGE THEORY 9. Once global warming took place changes that eventually occurred were: • Ice melted & land bridge was covered. • Mammoths & Mastodons died out. • First Americans became farmers (grew beans corn & squash).

  9. The Incredible Human Journey

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