Season 28Episode 81h 0m
The Day the Earth Melted
1991-02-250.0 rating
This episode of Horizon examines 20 years of research which has led to a new theory on how the earth's crust was made.
1991-02-250.0 rating
This episode of Horizon examines 20 years of research which has led to a new theory on how the earth's crust was made.