Most of the time, the shape of Earth’s magnetic field is quite similar to that which would be produced by a bar magnet ...

The Verde Mining district grew to become one of the greatest copper producers in Arizona from 1883 until 1992. Two primary mines produced more than 99% of the district’s copper production: the United ...

We show how this "cosmic clock" uncovers the evolution of rivers, coasts and habitats.

However, direct field observation continues to show that not all architectural elements within the plateau fit comfortably within these established models. The Mortuary Temple of Khafre, located on ...