how can scientist know what's inside earth's core when no one has been inside?
964908
Although some of the people trying to answer are clueless, this is actually a very good question which any scientist would be happy to hear from a student. It's exactly questions like this that make science work, and scientists ask this kind of question all the time.\n\nScientists don't just make pronouncements without any evidence. What they do is collect evidence and then try to imagine a model that, if its exists, would result in that evidence. So, if you look at the magnetic fields of the Earth and how they change, and the density and gravity of the Earth, and the kinds of materials that are ejected in different volcanos, etc and try to imagine what structure the Earth would have that would produce all those results, then you can make a model. AS time goes on, people find more and more facts, and the model gets changes so that it accounts for both the old facts and the new facts. After a while you have a model that is very reliable and allows you to make solid predictions about how the Earth operates. \n\nIf you asked any geologist about whether the descriptions of the center of the Earth are absolutely true, they would tell, you , Not absolutely, but they are the best educated guess we can make, based on the evidence we have. \n\nps there are no scientists who think that the center of the earth is full of big caves! That's BS.
84285
Of course, the inner core is solid. It is the outer core that is fluid. \n\nNo one really knows what is producing heat in the inner core, and in what proportions:\n\n1. radioactive decay\n2. tidal forces heating, due to gravity gradient of moon, sun etc graviational field \n3. exothermic reactions\n4. gravitational energy release as denser materials settle down into the middle\n5. insulation (some of the heat is still primoridial)\n6. frictional forces from movement of materials in the earth\n\nand so on. This is obviously a fairly complicated nonlinear system, and we do not understand all the physics involved.
226220
NASA DOES NOT KNOW.\neveryone is only guessing.\nthere is no specific,absolute proof.\nit's all assumptions.
58992
Scientists believe that the outer core is a liquid made out of an iron-nickle alloy, and the inner core is a liquid that behaves like a solid, and is mostly made out of iron.
231248
The clue is in your question:  "We find."  How do you know what becomes of antiparticles we don't find?
297650
no one will ever know that answer it happened along time ago put i dont think they had carpets and you would notice someone inside one if they did
144124
One common element that is found on this planet is Carbon. So they study the Half-Life of Radioactive isotopes to comeup with the age of a thing. Before the radioactivity method was discovered, scientists used early method. There is a formula that scientists used (Before the discovery of radioactivity method), which was first derived by Kelvin.\nHere is the formula. \n"\nAge = (To - T)2/ ( pi*K*GG2), \n\nwhere To is the formation temperature, T is today's temperature, pi is 3.14, K is a material property called thermal diffusivity (we'll use 1mm2/sec) and GG is the Earth's geothermal gradient (25 C/km). If To ranges from 1500 to 2000 C, the age of the earth would range from 36-65 m.y." - Courtesy: http://www.globalchange.umich.edu/ \n\nOfcourse, after discovering Radiogenic age determining methods, the way of measuring Age of things has changed.\nHere is the link that has more information of Radiogenic dating methods.\nhttp://www.globalchange.umich.edu/globalchange1/current/lectures/clocks_in_rocks/clocks_in_rocks.html\n\nhttp://www.ucmp.berkeley.edu/fosrec/McKinney.html
450131
As far as I know, they are still not sure as to what creates gravitational force. If they determine the source, one might negate it to experience zero gravity anywhere.
200265
No, you cant discover someone's secret who are not famous died at no where and decay away 10 years ago. You cant see the things which are too small, like the shape and structure of a subset of a photon. And some knowledge will be gone over time due to some reason. Sometimes, something is impossible, for example, someone ask u to fly using ur hands only without any device, tools, machines, planes etc (something which help u to fly and not from ur organ and are not attach to ur body), or maybe someone might ask u get to a place outside of milkyway (that have not yet been discover by anyone) in 1 seconds. See, it's impossible, right? If not, then I would really like to see that kind of things, it's a new discovery then.
546142
They use seismographs all around the world to see how earthquake vibrations move through the earth like giant sound waves. They can tell that there are different layers with different physical characteristics by the reflection and refraction of the seismic waves.\n\nThere are other methods to "see" inside the earth, but seismic exploration has been the most fruitful by far.
883595
The inner core has a radius of about 1,220 km (about 800 miles) and is located from 5,100 to 6,300 km (3,200 to 4,000 miles) below earth's surface. Recent discoveries suggest that the solid inner core itself is composed of layers, separated by a transition zone about 250 to 400 km thick.
310421
Are we alone? Probably not. It would be fairly conceited to think otherwise. What is the 'grand secret' the government doesn't want us to know? I really doubt there is any secret. I don't believe any foreign intelligent life has ever visited the earth. Frankly, if they have the technology to cover the vast distances to visit us, then they would have no interest in doing so. If it was the land they were interested in, then we would not be hear anymore. They probably could anihalate us in the blink of an eye.
45840
Could be. There is so far no way to know the temperature of the earth's core. We know from drilling that the temperature increases about 1 degree Fahrenheit for every 60 feet in depth. Of course, there is considerable variation in this from region to region, since it depends on the thickness of the crust, volcanic activity, ocean depth, etc. Anyway if you extrapolate that towards the core, it would give you an answer much greater than 12,000 degrees F. Most sources estimate about 7500 Kelvin or 13,040 F. We can attempt to model the core to calculate the temperature but since we don't know for sure what it is made of, and cannot reproduce the extreme pressure, it is hard to really know the temperature.
469431
That's a difficult question to answer, in that we would have to develop experiments to test if our theories were correct. If we had an idealized 'stasis field' (a container or defined zone in which time could be prevented from passing), we might be able to perform experiments to determine whether the things inside were still subject to entropy or whether they were removed from the general entropy gradient. The current prevailing theories hold that the contents of a stasis field (or container) are unaffected by entropy. This leads to the concept that entropy might be stripped from the events which cause it and transferred from object to object or from place to place, leading to unexpected catastrophes for no apparent cause. Once more, these things are difficult to determine.
447344
Theevilcrimsonking is correct. It has nothing to do w/ the earth's core!\n\nOil is found in porous permeable rocks. That means it is a network of holes that are connected together w/in the rock. It also has to be "trapped" by nonpermeable rock. These rocks are found on the outer layer of the earth (crust).\n\nI think it would be virtually impossible to remove every drop of oil out of these rocks due to the way they have so many small holes & connections.\n\nFurthermore, it is even harder to estimate exactly how much oil's out there. Some of it is economically feasible to obtain while some of it isn't worth all the hassle or money. It isn't profitable in other words.
553094
I would believe that analogy to be inaccurate.  The inner core is more of a very dense, solid mass of mostly iron and with its spin, among other things, gives our Earth its magnetic field.  The outer core, while quite hot, I would not call it a ball of fire.  It is more in the state of fluid, plastic like state which churns and, and at its boundary, mixes with the mantle to some degree.  Our planets core is dense and hot, but not a ball of fire.
850204
ALL of the evidence points to a solid earth. Zero evidence points to hollow earth. In fact, how could there even be earthquakes with a hollow earth? How could we measure them all over the world if the earth was hollow? How could gravity allow a holoow earth to form? How could volcanic eruptions happen with a hollow earth?\n\nThere is only evidence for a solid earth. Hollow earth people are complete based in non-science.\n\nThere is a reason that your links refer to paranormal.  There is an 'alternative' science section of Y!A, why don't you post there.