“would tunnel 7,000 feet underground, where rocks radiate heat from the earth’s molten core”
I’m sure if put to scale, 7,000 feet wouldn’t even be as deep as a dimple on a golf ball...a tad bit short of the Earth’s core.
--true enough but below a couple of thousand feet it get much hotter--Homestake Mine in South Dakota at the lowest levels had rock temp of about 140F ,Casa Grande in Arizona similar temp and the South African gold mines likewise---
--having spent about 23000 hours underground, I'd like to live long enough to see how this one works out--suspect the equipment will nearly all be automated--
“I’m sure if put to scale, 7,000 feet wouldn’t even be as deep as a dimple on a golf ball...a tad bit short of the Earth’s core.”
If the earth was shrunk down to the size of a ball-bearing, it would be 1,000 times smoother than the finest precision bearing ever made.
Fact.
I’m sure if put to scale, 7,000 feet wouldn’t even be as deep as a dimple on a golf ball...a tad bit short of the Earth’s core.“7,000 feet underground, where rocks radiate heat from the earth’s molten core”
Look at it this way:And don’t forget, according to our favorite scientist (and inventor of the INTERNET) the temperature of the earth’s core is "millions of degrees.” (thousands, millions - what’s three orders of magnitude when the issue is saving the earth?).
- If the earth’s core is hot enough to be molten Iron and other metals, it is way hotter than the surface.
- If the core is always hotter than the surface, heat is always flowing from the core to the surface.
- Anywhere on, or under, the surface of the earth where there is nothing to conduct heat from the earth’s core, will "radiate heat from the earth’s molten core.”
And 7000 feet of earth’s crust is sufficient insulation to make the temperature at the earth’s surface (“normal” to us surface dwellers) distinctly cooler than the temperature over a mile closer to "the earth’s molten core.”