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mantle

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11y ago
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1w ago

Humans have penetrated the Earth's crust, specifically through drilling boreholes for oil exploration or scientific research. The deepest man-made hole is the Kola Superdeep Borehole in Russia, reaching a depth of about 7.5 miles (12 kilometers) into the Earth's crust.

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Q: Which layer of the earth man has penetrated?
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