Seismic mapping of North America has revealed that an ancient slab of crust buried beneath the Midwest is causing the crust ...

North America is the third largest continent in the world. It is located in the Northern Hemisphere. The north of the continent is within the Arctic Circle and the Tropic of Cancer passes through ...

Malcolm Lewis, expert on maps and North American native cultures ... it doesn't show accurately the physical distances on the ground, but rather their relative positions. Native Americans ...