http://www.newsweek.com/giant-blob-africa-earth-core-mantle-anomoly-rising-1687664 > Deep beneath Earth's surface, on opposite sides of the planet, sit two enormous blob-like structures spanning thousands of miles. And one of them, beneath Africa, is slowly creeping up towards the surface. > Scientists first spotted the two giant structures via seismic observations. These anomalies sit in the lowermost mantle, between around 400 and 1,600 miles below Earth's surface, above the outer core.