Since then, scientists have managed to study a bit extra in regards to the mantle, the layer that lies beneath the Moho, which amounts to 83 percent of the Earth's volume and 67 p.c of its mass Encyclopaedia Britannica. To make things more difficult, as they drill deeper into the Earth, they're going to encounter extreme temperatures, probably in excess of 1,000 levels Fahrenheit (538 degrees Celsius), and improbable amounts of stress - as a lot as 4 million pounds per square foot in the vicini...