What are the mysterious continent-sized lumps deep inside Earth?

For decades, planetary scientists have been trying to understand the origins of two colossal geological anomalies inside our planet. New insights suggest they could be leftovers from a cosmic collision

What are the mysterious continent-sized lumps deep inside Earth?
For decades, planetary scientists have been trying to understand the origins of two colossal geological anomalies inside our planet. New insights suggest they could be leftovers from a cosmic collision