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sciencing.com/5-earths-inner-core-13761.html

Because the Earth's inner core is a solid lump of iron, you may think that it is the source of the Earth's magnetic field. But this is not the case. The Earth's outer core, which consists of molten iron and nickel, flows around the inner core, and this motion produces the magnetic field.

www.dkfindout.com/us/earth/structure-earth/inner-core

The inner core is the fourth layer inside the Earth. It is a solid metallic ball made mainly of iron.Here, temperatures reach extraordinary levels, estimated to be between 7,200–8,500ºF (4,000–4,700ºC).

www.softschools.com/facts/geology/inner_core_facts/2207

Interesting Inner Core Facts: The temperature of the inner core is believed to be approximately 5400 degrees Celsius, or 5700 Kelvin. This heat is caused by three elements: residual heat from the formation of the earth, gravitational forces from the moon and the sun, and and radioactive decay of earth's inner elements.

en.wikipedia.org/wiki/Inner_core

Earth's inner core is the innermost geologic layer of the Earth. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 20% of the Earth's radius and 70% of the Moon's radius. There are no samples of the Earth’s core available for direct measurement, as there are for the Earth's mantle.

www.dkfindout.com/us/earth/structure-earth/outer-core

The center of the Earth is made up of two layers, the outer core and the inner core. The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. The outer core is responsible for Earth’s magnetic field.As Earth spins on its axis, the iron inside the liquid outer core moves around.

gamediv1.weebly.com/inner-core.html

The Inner Core is the final layer of the Earth. It is a solid ball made of metal. To learn about what metal the Inner Core is made of, read this section about the Inner Core. You can also learn how hot the Inner Core is, how thick it is and some interesting facts about the Inner Core.

www.reference.com/science/interesting-earth-s-inner-core...

The inner core is the Earth’s deepest layer, and it is a solid iron ball that is approximately 1,500 miles in diameter. Although it is extremely hot, the iron cannot melt due to the high pressure. The inner core also consists of nickel and sulfur and smaller amounts of elements other than iron.

www.answers.com/Q/What_are_facts_about_earths_outer_core

the inner core is made of iron and nickel and is the hottest layer. the crust is brown and is the smallest layer of the earth. this can get hot but the lowest it has been re ...

factfile.org/10-facts-about-earths-core

Facts about Earth’s Core 7: the layers of inner core. The inner core is composed of two layers according to a Chinese scientist in 2015. Both are the outer inner core and inner core. Find facts about Earth’s Crust here. Facts about Earth’s Core 8: the inner core boundary. The inner core boundary has the temperature at 5400 degrees C or ...

www.kids-earth-science.com/earths-core.html

Earths Core Inner & Outer Cores. The Earths core and the structure of the Earth cannot be studied directly because of the pressure and heat inside our planet. Instead, scientists study the Earth using seismic waves generated by earthquakes. They study the speed earthquakes move through different densities of rock.