Earth Sciences & Geology. How Do We Know That There's A Core In The Centre Of The Earth?
Earth Sciences & Geology. Like, We Didn't Dig In Did We? Look, I'm Sorry If I Seem Ignorant But I Really Don't Know. Its All Theory And Speculation,
Earth Sciences Geology : How Do We Know That Theres A Core In The Centre Of The Earth
Like, we didn't dig in did we? Look, I'm sorry if I seem ignorant but I really don't know. ~~~ Angel ~~~
Best Answer To Earth Sciences Geology Question
cuz of the science. but i am not surprised if there is somethin else
All Answers To Earth Sciences Geology Questions
Answer 1cuz of the science. but i am not surprised if there is somethin else
Answer 2Its all theory and speculation, they think theres a core due to plate movement and stuff like that but no-one has ever been down there so we do not really know
Answer 3When an earthquake hits on one side of the earth the reactionary waves are also detected at corresponding angles on the opposite side of the planet.
Answer 4I think it's just that the theory of tectonic plates and the lava etc make sense and complete the puzzle. And the further down you go the hotter it gets (i think that has been tested with some dudes who dug a really big hole/tunnel, maybe i'm just imagining though). I think there are probably some science things which make things match up so it can be assumed there is a core. Probably too complicated for somebody like me to understand...
Answer 5Check this out!...
Answer 6we don't...it's all speculations
Answer 7Core The average density of Earth is 5515 kg/m3, making it the densest planet in the Solar system. Since the average density of surface material is only around 3000 kg/m3, we must conclude that denser materials exist within Earth's core. Further evidence for the high density core comes from the study of seismology. Seismic measurements show that the core is divided into two parts, a solid inner core with a radius of ~1220 km and a liquid outer core extending beyond it to a radius of ~3400 km. The solid inner core was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily of iron and some nickel. In early stages of the Earth's formation about billion ( × 109) years ago, melting would have caused denser substances to sink toward the center in a process called planetary differentiation (see also the iron catastrophe), while less-dense materials would have migrated to the crust. The core is thus believed to largely be composed of iron (80%), along with nickel and one or more light elements, whereas other dense elements, such as lead and uranium, either are too rare to be significant or tend to bind to lighter elements and thus remain in the crust (see felsic materials). Some have argued that the inner core may be in the form of a single iron crystal. The liquid outer core surrounds the inner core and is believed to be composed of iron mixed with nickel and trace amounts of lighter elements. Recent speculation suggests that the innermost part of the core is enriched in gold, platinum and other iron-loving (siderophile) elements. The matter that is the Earth is connected in fundamental ways to the matter of certain chondrite meteorites, and to the matter of the outer portion of the Sun. There is good reason to believe that the Earth is, in the main, like a chondrite meteorite. Beginning as early as 1940, scientists, including Francis Birch, built geophysics upon the premise that the Earth is like ordinary chondrites, the most common type of meteorite observed impacting Earth, while totally ignoring another, albeit less abundant type, called enstatite chondrites. The principal difference between the two meteorite types is that enstatite chondrites formed under circumstances of extremely limited available oxygen, leading to certain normally oxyphile elements existing either partially or wholly in the alloy portion that corresponds to the core of the Earth. It is generally believed that convection in the outer core, combined with stirring caused by the Earth's rotation (see: Coriolis effect), gives rise to the Earth's magnetic field through a process described by the dynamo theory. The solid inner core is too hot to hold a permanent magnetic field (see Curie temperature) but probably acts to stabilise the magnetic field generated by the liquid outer core. Recent evidence has suggested that the inner core of Earth may rotate slightly faster than the rest of the planet. In August 2005 a team of geophysicists announced in the journal Science that, according to their estimates, Earth's inner core rotates approximately to degrees per year relative to the rotation of the surface. The current scientific explanation for the Earth's temperature gradient is a combination of the heat left over from the planet's initial formation, the decay of radioactive elements, and the freezing of the inner core. Other explanations include the georeactor hypothesis. inner core The existence of an inner core distinct from the liquid outer core was discovered in 1936 by seismologist Inge Lehmann using observations of earthquake-generated seismic waves that partly reflect from its boundary and can be detected by sensitive seismographs on the Earth's surface. The outer core was thought to be liquid due to its inability to transmit elastic shear waves because only compressional waves are observed to pass through it. The solidity of the inner core has been difficult to establish, because the elastic shear waves that are expected to pass through it are very weak and difficult to detect. Dziewonski and Gilbert established the consistency of this hypothesis using normal modes of vibration of Earth caused by large earthquakes. Recent claims of detections of inner core transmitted shear waves were initially controversial but are now gaining acceptance.
Answer 8If we didn't have an iron core we wouldn't have a magnetic field. If we didn't have a magnetic field, life would never have survived on earth.
Answer 9we speculate it because of seismology, (earthquakes), but there has been few arguements about it. I read in Scientific American that some dude belives the core is like nulclear fission, much like the sun. He even explained how this theory explains the electrpmagnetic field. I'm stickin with a solid core for now though.
Answer 10we dont know for sure, we can make guesses, but scientist think this theory is the best, personally, i believe in magic
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