Why+is+the+centre+of+the+earth+so+hot?


 * __WHY IS THE CENTRE OF THE EARTH SO HOT?__**

Answer the question below, append new answers to the top of this page. _ __Response 1:__ The Earth is divided into four sections the crust, mantle, outer core and the inner core. In this scenario, the center of the Earth is referred to as the inner core. The outer core is liquid, whereas the inner core is solid. The outer core is approximately 2,300km thick, and the inner core is about 1,200km thick.
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The reason that the center of the Earth is so hot is a combination of the decay of radioactive materials, frictional heating that is caused by core material that sinks to the center of the planet and the lingering heat from the formation of the Earth When the matter that created Earth came together, it picked up kinetic energy that was falling in, the kinetic energy was then turned into heat.

The kinetic energy of an object is the energy that is possessed by that object due to its motion. It is the work needed to move an object of a given mass from rest to its stated velocity. The object maintains the kinetic energy unless the speed of the object changes.

Velocity is the speed of an object.

The term work in physic is work that is done when a force pushes or pulls an object and moves that object some distance in the direction it’s being pushed or pulled.

Melanie D. February 23, 2012

Citations: [|http://helios.gsfc.nasa.gov/qa_earth.html#hot] [] [] [] []

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