Unexpected mantle structures hint at ancient or unknown materials, challenging current tectonic theories and prompting deeper research. No one can see inside the Earth or drill deep enough to collect rock samples from the mantle—the layer between Earth’s core and its outermost rigid layer,

New research reveals a “major mystery” deep beneath the planet’s bodies of water and crust, and now experts are rethinking what they know about Earth’s terrain. They suggest it could even mean “a lost world” under the sea.

Geoscientists have used earthquakes to study the composition of the lower portion of the Earth’s mantle under the Pacific Ocean – and they've discovered something quite peculiar. There are zones where the seismic waves move in different ways,

Mystery Structures Present Under the Pacific Ocean Baffle Scientists, Unsure What These Are Made up Of Researchers have continued to study what lies beneath the Earth's crust for a long time. They have made some fascinating discoveries after examining the lower portion of the planet's mantle under the Pacific Ocean.