How deep is the deepest well that human dug ? how does that compare to the thickness of the earth

In terms of depth below the surface, the KOLA
deep hole sg-3 retains the world record at 12,62 metres ( 40, 230 ft.) in 1989 and is still the deepest point on earth

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.