center of the earth

As far as I know it is the only real "picture" that we have that explains the data we have. What other story? Please show the calculations that produce "another story".Actually we already know that you and Walt have no clue what you are talking about. You are not going to produce any coherent sensible other story.When you've done your homework please drop back and give us the results.

Cosmo, are you actually reading what is posted in this and other threads?There are two theories of gravity we use. One is a little bit wrong the other may very well be. Newton's is the first, wrong but accurate enough for many uses. Einstein's is the second which corrects Newton's in the extreme cases. Because of some outstanding issues the best therory of gravity we have is not as solid as the theory of evolution.Things still fall down, we many just not have some very, very fine details of why they fall down right. (Mind you it may be the the general theory of relativity is fundamentally wrong not just in the details.)The gravitational attraction between objects depends on their mass not (directly their density). This was pointed out to you just a bit ago. Since it also varies with the distance there are some circumstances where it can appear to vary with density but that is not correct.Some of this stuff is both new to you and not really easy. For that reason you are going to have to read, re-read and move along at a careful pace.The reason we know that the gravitation attraction is based on mass is because it has been measured to be and measured very, very, very carefully. I'm not as sure but I think it is also a theoretical result of general relativity (our best theory of how gravity works). I can't do the math at that level though. The agreement between theory and measurements in this case is very good.

You misunderstand big time. The theory of gravity is worrisome because it doesn't fit with quantum mechanics yet. There is a chance that it, like Newton's theory breaks down on the extremes. However, these extremes are at what is called the Planck length. That is about 10**-43 of a meter(cm? what's a factor of a 100 between friends eh?).I would expect the results of GR to hold even if it is totally replaced by something else. Just as Newton's theory is still useful in many cases even if totally replaced by GR.You can be certain that the Earth is approximately described by geologists today. There are lots of details but I'll bet big dollars that the basic form is as described.The uncertainties are in details that are of no relevance to our discussions here.

I think you should let people think you are trolling. To allow them to think you are actually serious will demonstrate something that you don't want anyone to think.

That is correct. But it has a way to go yet.

But that was Newton's idea (remember he was a God fearing man so he can't have been wrong). You remember the apple? That is what is at the center of the Earth: an apple. Newton proved that apples always fall down. And since there was an apple tree in the garden of Eden,well, then apples have been around a long time. Since they always fall down they all have to be at the center of the Earth. They can't go back up after all can they? So that answers all your questions about the earth. It is apples all the way down. Just like Newton figured out (and, you remember, he believed in God so it must be correct.)

Actually you are right there.The current geophyisical view is the best explanation and model that we have is a more correct statment of the situation.However, it is so well founded that "correct" in the colloquial sense is also not far off.But you might have learned a bit about science in all this. Various models are proposed, the evidence is used to batter at them, the one(s) remaining standing are the current champions.You have no idea how much scrutiny that the current views have undergone. It is a very very safe bet that you will not beging to be able to find anything that comes close. After you get your PhD in the field you might know enough to make a small change somewhere.