The earth crust is thick and cold; so the continental crust is about 35 - 40 km, in addition to the earth mantle which is about 2,900 km thick.
Therefore, there is about 3,000 km separating man on the earth surface from the very hot core of the earth. And this is a very extensive distance.
So that whatever man may dig under the ground, he will never reach to the earth core.
The crust is cold, and it gets hotter as we go deeper, until it will be about 200 C at the meeting of the crust with the mantle.
This in fact is one of the great blessings of God for man, so that man may resort to the caves and subterranean vaults, and moreover, his body will be buried under the ground following his death. In addition, he will resort to the graves and underground vaults and caverns when he will be a soul in the afterlife.
Quran 76: 25, which mean:
{25. Have We not made the earth as a sheltering [for them:]
26. [Both for] the living and the dead? a}
..........................................................................
26 a The meaning: We have made the earth as a home and a hiding place during their life and following their death.
So during their life: the subterranean vaults, caves and caverns are their hiding places inside which they may go rapidly and hide; while after death, their hiding will be in graves, and caves will be their homes.
The meaning: We have made the cold crust of the earth thick; so that whatever subterranean vaults, wells and mines you may dig in it, you will not reach to the fire in the core of the earth.
This in fact is among Our favors on you; because had the cold crust been thin, then you could not have dug in it and dwelt inside it, but then a volcano would have erupted under your feet to destroy you utterly.
http://quran-ayat.com/pret/77.htm#a77_25
quran-ayat.com/pret/77.htm#a77_25
Therefore, there is about 3,000 km separating man on the earth surface from the very hot core of the earth. And this is a very extensive distance.
So that whatever man may dig under the ground, he will never reach to the earth core.
The crust is cold, and it gets hotter as we go deeper, until it will be about 200 C at the meeting of the crust with the mantle.
This in fact is one of the great blessings of God for man, so that man may resort to the caves and subterranean vaults, and moreover, his body will be buried under the ground following his death. In addition, he will resort to the graves and underground vaults and caverns when he will be a soul in the afterlife.
Quran 76: 25, which mean:
{25. Have We not made the earth as a sheltering [for them:]
26. [Both for] the living and the dead? a}
..........................................................................
26 a The meaning: We have made the earth as a home and a hiding place during their life and following their death.
So during their life: the subterranean vaults, caves and caverns are their hiding places inside which they may go rapidly and hide; while after death, their hiding will be in graves, and caves will be their homes.
The meaning: We have made the cold crust of the earth thick; so that whatever subterranean vaults, wells and mines you may dig in it, you will not reach to the fire in the core of the earth.
This in fact is among Our favors on you; because had the cold crust been thin, then you could not have dug in it and dwelt inside it, but then a volcano would have erupted under your feet to destroy you utterly.
http://quran-ayat.com/pret/77.htm#a77_25
quran-ayat.com/pret/77.htm#a77_25