Modelling suggests the giant impact that formed the moon also left behind material deep inside Earth that may have helped kick off plate tectonics.

Odd Lumps Researchers are suggesting that a powerful collision between the Earth and a Mars-sized object dubbed Theia some 4.5 billion years ago may have left "mysterious blobs" buried deep within Earth's interior,

A small team of geologists and seismologists at the California Institute of Technology has found evidence via computer modeling that suggest giant blobs of material near the Earth's core, believed to have been created by a cosmic collision 4.