The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways ...

The researchers theorize that these far-off remnants could either be deposits of silica-rich material that have hung around since the formation of the mantle four billion years ago, or areas where ...

Plates can also move past each other, like at the San Andreas Fault in the USA, which forms the tectonic boundary between the Pacific Plate and the North American Plate. These are known as ...