We know that there is oil beneath the earth’s surface, and that humans drill for that oil every single day. This requires a hole to be dug deep enough to reach the oil. So if the earth’s continental crust is between 30 and 50 miles thick, how deep do you think humans have dug? Check out this video to see a comparison of how deep humans have gone into the earth’s crust.
Stop robocalls for good with Kim’s eBook
Robocalls interrupt us constantly and scam Americans out of millions of dollars every year. Learn Kim's best tricks for stopping annoying robocalls in this handy guide.