The Mantle
The thick shell is then replaced by the mantle, an enigmatic inner layer. This deeper layer is responsible for about 40% of the Earth’s mass. This resulted in an interesting excursion for scientists and researchers.
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Project Mohole
In 1958, the United States took the lead by launching Project Mohole. It is just a short distance from Guadalupe, Mexico. The project needed a team of engineers to dig into the Pacific Ocean’s bed.