Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Friction Inside The Earth Is A Source Of Heat

01.07.2002


There is high temperature inside our planet and the reason is not known yet. A common belief that the Earth`s interior is heated by radioactive elements is now doubted of. Professor Felix Letnikov from Irkutsk Institute of the Earth`s Crust have proposed an idea that the heat is formed in the outer core because of friction between its layers.

Different geophysical data confirm that there is a heat source inside the Earth. In the mantle there are zones with low viscosity, which correspond to molten substance. However, melting rocks requires a lot of energy - so, the question about a source of the energy arises. According to current information, the core consists of two parts: a liquid outer part and a solid inner part. The outer core begins at the depth of 2900 km and is 2346 km thick; it holds 31% of the Earth`s mass. It is pressed between the inner core and the mantle, and because of the Earth`s axial rotation there is friction and heat formation between these two matters. Still, that is not the main heat source. In the outer core at different depths there are different temperature, pressure, viscosity and density, and this results in stratification. Try to spin a tin with condensed milk stored for some time on a shelf. Inside the milk, layers will rub against each other and the tin`s sides. And the fact that friction causes heat is well-known.

According to Letnikov`s theory, heat explosions happen because sometimes heat does not go away to the mantle. In such situation the core contents is of a big role. It includes iron with some nickel and many gases - hydrogen, sulphur and carbon. When explosion happens, a part of the gases mixture detaches and flows away into the mantle. This process is thought to be the cause of most of the abyssal processes.



For millions of years gas streams travel through the mantle to the crust. It takes a lot of energy from the stream and some of them never reach the surface. However, those who succeeded in getting outside cause different troubles, like eruptions, lava flows and earthquakes. Moreover, the stream`s heat loss may be recovered by chemical reactions: the stream contains much hydrogen and 80% of the mantle volume is taken by oxygen. The result of the reaction is water and heat. In addition, such streams carry many rare elements, therefore, producing large areas of minerals.

Until the Earth has the liquid core, the heat flow is guaranteed, but geologists say that, with time, abyssal processes are gradually dying down.

Tatiana Pitchugina | alfa
Further information:
http://www.informnauka.ru/eng/2002/2002-06-28-02_146_e.htm

More articles from Earth Sciences:

nachricht A promising target in the quest for a 1-million-year-old Antarctic ice core
24.05.2018 | University of Washington

nachricht Tropical Peat Swamps: Restoration of Endangered Carbon Reservoirs
24.05.2018 | Leibniz-Zentrum für Marine Tropenforschung (ZMT)

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Powerful IT security for the car of the future – research alliance develops new approaches

The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.

Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

In focus: Climate adapted plants

25.05.2018 | Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

 
Latest News

In focus: Climate adapted plants

25.05.2018 | Event News

Flow probes from the 3D printer

25.05.2018 | Machine Engineering

Less is more? Gene switch for healthy aging found

25.05.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>