The document discusses three theories for how humans first arrived in North America: 1) The widely accepted Bering Strait Theory that a land bridge formed during the last ice age, allowing humans to migrate from Asia over millions of years. 2) The Ocean Crossing Theory that early Africans, Vikings, or Aborigines could have crossed oceans to settle the Americas. 3) The Aliens Theory, which is not widely accepted, that suggests cave drawings and architectural similarities provide evidence of alien contact or influence.
2. Theory Definition – an explanation based on evidence but not a fact. We will look at 3 theories on how people first arrived in the Americas.
3. Theory #1The Bering Strait Theory This is the most accepted theory During the last ice age the Bering Strait was frozen creating a “land bridge” Over millions of years humans traveled out of Africa and finally across the land bridge
4. Theory #2Ocean Crossing Theory It is a possibility that early Africans, Vikings, or even Aborigines crossed the ocean and began to populate the Americas.
5. Theory #3Aliens Not a widely accepted theory There is some evidence in cave drawings and similar building styles Mexico Egypt
