First, scientists are pretty sure the Earth's core is about 80 percent iron. How they know that is a series of educated guesses.
For starters, they can be reasonably sure of the planet's mass based on its gravitational pull. The material on the surface isn't dense enough to match up with that mass, so the rest of the Earth has to be much denser.Iron, meanwhile, is one of the most prevalent elements in the universe, but it isn't all that evident in the Earth's crust. Since scientists would expect more iron to be in our planet and it's a fairly dense element, that leads to the conclusion that the Earth's core is mostly iron. They theorize that it was pulled to the core over millions of years. By examining different seismic waves, they know that the inner part of the core is solid and the outer core is molten.
It's a lot more scientific than I've made it sound, but hopefully that gets at the gist of it.
How about reading the Bible and finding out what God did as he made this earth?
A tunnel, dug from one side of the Earth to the other would be, on average, 12,742 km. So it's a shorter trip, sure, but that's not the best part.
If you jumped into the tunnel, you'd fall down towards the center of the Earth, accelerating constantly, thanks to gravity. By the time you reached the halfway point, after falling for 21 minutes, you'd be traveling at 28,000 kilometers per hour.
Scientists build machines that can't be melted that tunnel through the earth, that's how you know what's at the earth's center.
The center of the earth is Hot with Fire!
Guess how come volcanos have hot Lava coming out of them?
I am sure IF you dug your way towards the center of the earth, you could feel when It became so HOT! Nearer to the center.
How about you pray to God about this?
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