Deeply hidden in Earth’s mantle there are two huge ‘islands’ with the size of a continent. New research from Utrecht ...

Deep within Earth’s mantle lie two enormous regions, often referred to as "islands," which are the size of continents.

Continent-size islands deep inside Earth's mantle could be more than a billion years old, a new study finds.

1. Figure 1: Map of the northern Cascadia subduction zone showing the distribution of earthquakes in the subducting Juan de Fuca plate and the locations of seismic cross-sections. Green dashed line ...