He claimed that they were one large supercontinent called Pangaea. His evidence for his claim was that the general shapes of the separate continents and how they can fit together if you arrange them. He noticed patterns in the mountain ranges; when all the continents are together the ranges line up with one another.
I think 1991 it was the fall of soviet union
- people s increased exposure to ideas
- development of a increasingly global culture
The mantle and the crust!!!!!
