Scientists have learned new information about the ancient ocean floor at the core-mantle boundary of our planet.
An illustration of how seismic waves from earthquakes in the southern hemisphere sample the ultra-low velocity zones structure along the Earth’s core-mantle boundary and are recorded by sensors in Antarctica.A thin, yet dense, sunken ocean floor could be deep between the Earth’s core and mantle. The findings of aused global-scale seismic imaging of Earth’s interior to search for clues of a long buried ocean.
About 2,000 miles below the Earth’s surface, the planet’s rocky mantle meets the molten, metallic outer . Previously, a possible ancient ocean floor on the core-mantle boundary had only been observed in isolated patches. The latest research suggests that this layer may actually cover a large portion of the core-mantle boundary of Earth.Understanding the composition at the core-mantle boundary on a large scale is difficult since it is so deep within the Earth.
The team noticed that at the core-mantle boundary, seismic waves slowed down when they hit a particular layer. This layer is about three to 25 miles thick, but is actually very thin in terms of planetary composition. Since the seismic waves slowed down in these areas, they are categorized as
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