“The Lost Story” –Continent-Sized ‘Fossils’ of Ancient Earth

Earth from Moon Apollo 12

 

Scientists long theorized that separated continents deep in Earth’s mantle came from subducted oceanic plates. But the new study indicates these distinct regions may have been formed from an ancient magma ocean that solidified during the beginning of Earth’s formation and may have survived the massive Moon-creating impact. These ancient, distinct, continent-sized regions of rocks, isolated since before the collision that created the Moon 4.5 billion years ago, exist hundreds of miles below the Earth’s crust, offering a window into the building blocks of our planet.

(more…)