Wikimedia Commons. What is Quantum Entanglement: Explained in Simple Words. When Earth was formed about 4.5 billion years ago, it was a uniform ball of hot rock. Yes, it is extremely hot, but it has been like that since the birth of the Earth. But the core is continually heated by the decay of radioactive elements. And here’s a link to NASA’s Earth Observatory. The most surprising part is that even with such high temperatures, the inner core is totally and completely solid, and is around 1,200 km thick. We also can speculate that the inner core began to freeze (solidify) about 1 or two billion years ago. Seismic waves and how we know earth's structure. The outer core surrounding it is an ocean of liquid metal 2,300 kilometers thick. This section is 2,900 km thick. Current theory says Earth’s center consisted of a ball of hot liquid iron 4,200 miles wide until about a billion years ago when the molten metal spontaneously began to solidify. This heat is the initial source for the temperatures in the Earth’s interior. The difference in temperature matters, because this explains how the Earth generates its magnetic field. She  loves reading and learning. Sorry, your blog cannot share posts by email. The first is heat left over from the formation of the Earth. The crust is pretty thin if we compare it to the other layers. If it went cold, became too solid or too liquid, there would simply be no way for life to survive or thrive. This is the currently selected item. Why the Earth’s iron core is solid although it’s hotter than the sun’s surface A lifelong debate surrounding the inner core's phased was finally settled by Swedish researchers. This is the layer where we live, build houses, and plant trees. Earth’s formation through accretion (Photo Credit : TheVagabond V.Schaal/Shutterstock). Join us at patreon.com/universetoday. ASHEVILLE (BP) — If naturalistic theories are correct, Earth’s solid inner core shouldn’t exist, according to a new research paper in Earth and Planetary Science Letters journal. – Amelia, age 13, Devon, UK. r/explainlikeimfive: Explain Like I'm Five is the best forum and archive on the internet for layperson-friendly explanations. Earth’s core is the hottest place on the planet, and among the hottest places in the solar system. It is believed that the primordial heat is mostly concentrated in the core and heat released due to radioactive decay gets distributed throughout the planet’s other layers. The Earth's rotation makes this ocean flow and swirl, and the moving metal generates the planet's magnetic field. cowanscience TEACHER. In … Crossing the outer core, we reach the hottest part of the planet, which is the inner core. You wake up feeling pretty excited, but alas, when you look outside the window, the snow has covered every single speck of soil. Since the Earth's magnetic field (which protects the atmosphere and biosphere from harmful radiation) is generated by molten iron in the core, the solidification of the core might seem quite foreboding. The two parts are solid inner core, and liquid outer core. Some thermal energy is produced by radioactive decay and tidal friction but this is not necessary. http://www.ccmr.cornell.edu/education/ask/index.html?quid=215, Join our 836 patrons! The slow cooling of our planet causes the molten iron in the outer core to flow and swirl fast as heat is transported to the mantle, and this gives Earth its magnetic field. http://helios.gsfc.nasa.gov/qa_earth.html#hot Other. Researchers suggest that this iron core exists in a never-before-seen atomic state that allows it to withstand the incredible temperatures and pressures found in the centre of our planet – … How Do Screen Protectors Protect A Phone’s Screen? Earth’s tectonic plates essentially act … There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements. The outer core surrounding it is an ocean of liquid metal 2,300 kilometers thick. http://www.physorg.com/news62952904.html Radioactive decay is responsible for the formation of daughter isotopes, which is an exothermic process. The solid inner core is too hot to hold a permanent magnetic field (see Curie temperature) but probably acts to stabilize the magnetic field generated by the liquid outer core. However, is this hot core really helping us in any way? That is pretty hot. It is thank to the continous nuclear fission of elements in the Earth’s interior that replaces the heat the Earth loses keeping it nice and hot. As Earth grew by the addition of meteorites it would have started to warm up, mainly from heat from the decay of radioactive elements plus heat from the kinetic energy of meteorite impacts. The next layer present just below the crust is known as the mantle. But the sun's surface isn't all that hot, at least compared with its atmosphere. Here’s an article about the Earth’s outer core, and here are some interesting facts about the Earth. Meanwhile, heavy materials like iron sink down to the Earth's core, generating frictional heat en route — up to 3000 degrees Fahrenheit. First, there is heat left over from when the planet formed and accreted. The Earth's core is approaching stability with the supportive surface flux balance. And updates to your email addresses plant trees primordial heat we live build! Exothermic process parts of the Earth 's core is as hot as the of. However scientists say the temperature down there is heat left over from the formation of the sun is to... 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