Scientists find hidden layer in Earth's inner core

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Traditionally students have been taught that the Earth has four distinct layers: the crust, the mantle, the outer core and the inner core.

Now, a new study by researchers from the Australian National University provides evidence of an additional layer inside the inner core.

According to the study, which was published in the Journal of Geophysical Research, the inner core is made primarily of iron and nickel. The innermost core is composed mainly of iron and is around two-thirds the size of the Moon.

The authors of the study write this suggests that some sort of cataclysmic and previously unknown event occurred early in the Earth's history — perhaps as early as 4.5 billion years ago.

RUNDOWN SHOWS:
1. Traditional four-layer model of Earth
2. Five-layer model proposed by new study
3. Composition of inner core and innermost core
4. Depiction of Earth 4.5 billion years ago
5. Depiction of Earth's surface 4.5 billion years ago

VOICEOVER (in English):

"Traditionally students have been taught that the Earth has four distinct layers: the crust, the mantle, the outer core and the inner core."

"Now, a new study by researchers from the Australian National University provides evidence of an additional layer inside the inner core."

"According to the study, which was published in the Journal of Geophysical Research, the inner core is made primarily of iron and nickel."

"While the innermost core is composed mainly of iron and is around two-thirds the size of the Moon."

"This suggests that some sort of cataclysmic and previously unknown event occurred early in the Earth's history — perhaps as early as 4.5 billion years ago."

SOURCES: Journal of Geophysical Research, Australian National University
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JB020545
https://science.anu.edu.au/news-events/news/scientists-dig-deep-reveal-earths-hidden-layer