The heat that is present in Earth's mantle is made up of leftover heat from when the planet was formed, latent heat from the Earth's inner core and heat produced by the decay of radioactive isotopes. The majority of the heat is caused by the decay of isotopes such as potassium 40 and uranium 238.
When an isotope breaks down, it sheds extra energy so that it can become more stable. This extra energy is radiated as heat and warms the mantle.
Earth's core contains liquid metal that expands a little bit every year. This expansion causes heat to spread to the mantle.
The Earth was created when gravity caused particles and hot gases to condense into a planet. Heat was also created by this process, and some of the heat is still around, warming the mantle.Learn More
Seismological studies have measured the Earth's inner core at approximately 760 miles in diameter. The presence of the solid nickel-iron alloy inner core was extrapolated in 1936 by Inge Lehmann from reflections of seismic waves off the boundary area between the outer and inner cores, known as the Lehmann discontinuity.Full Answer >
The earth's core is divided into two layers: the outer and inner core. The outer core borders the Earth's mantle and is approximately 1,430 miles in thickness. The inner core has a thickness of 750 miles, giving the core a combined thickness of 2180 miles.Full Answer >
The Earth is divided into four layers: crust, mantle, outer core and inner core. The crust is the only layer of Earth that hosts life, as the mantle, inner core and outer core are too hostile for organisms to exist.Full Answer >
The Earth consists of four layers: crust, mantle, outer core and inner core. Each layer has its own properties and characteristics that separates it from the other layers.Full Answer >