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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.

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.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.

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.

gamediv1.weebly.com/outer-core.html

The Outer Core is the second to last layer of the Earth. It is a magma like liquid layer that surrounds the Inner Core and creates Earth's magnetic field. In this section you will learn about how Earth's magnetic field is created, how hot it is, how thick the Outer Core is and a few interesting facts about the Outer Core.

wiki.kidzsearch.com/wiki/Earth's_core

The Earth's core is the part of Earth in the middle of our planet. It has a solid inner core and a liquid outer core.. Outer core. The outer core of the Earth is a liquid layer about 2,266 kilometers thick. It is made of iron and nickel.This is above the Earth's solid inner core and below the mantle.Its outer boundary is 2,890 km (1,800 mi) beneath the Earth's surface.

en.wikipedia.org/wiki/Inner_core

The velocity of the P-waves in the core also varies smoothly through the inner core, from about 11.4 km/s at the center to about 11.1 km/s at the surface. Then the speed drops abruptly at the inner-outer core boundary to about 10.4 km/s.: fig.2. Size and shape.

www.coolkidfacts.com/layers-of-the-earth-for-kids

Core of the Earth Facts The core is made of two layers – the inner and outer core. When the Earth formed 4.5 billion years ago, the heavy substances sunk to the middle and these formed the inner core. The lighter ones are like air and water stayed on the top on the crust.