How do we know what materials the interior of the Earth is made of if the farthest we have dug is 8 miles?
We learned about the three layers of the Earth during grade school – the crust, mantle, and core. For the last five decades, science researchers have been digging into our planet’s center. The most in-depth hole humans ever dug was only 8 miles down. That 20-year excavation project barely penetrated the crust, … Read more