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en.wikipedia.org/wiki/Earth's_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 or 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.Information about the Earth's core mostly comes ...

www.nationalgeographic.org/encyclopedia/core

The core is the hottest, densest part of the Earth. Illustration by Chuck Carter. Buried Treasure. Although the inner core is mostly NiFe, the iron catastrophe also drove heavy siderophile elements to the center of the Earth. In fact, one geoscientist calculated that there are 1.6 quadrillion tons of gold in the core—that’s enough to gild ...

en.wikipedia.org/wiki/Earth's_outer_core

Earth's outer core is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface. The transition between the inner core and outer core is located approximately 5,150 km (3,200 mi) beneath the Earth's surface.

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

The top layer, known as the crust, is the thinnest layer of the Earth with a thickness of 30 km (18.6 miles). Below the crust, there are four distinct layers and these are called the upper mantle, lower mantle, outer core and inner core. The inner core of the Earth has a number of surprising properties.

gamediv1.weebly.com/inner-core.html

The Inner Core is about 1250 km thick and is the second smallest layer of the Earth. Although it is one of the smallest, the Inner Core is also the hottest layer. The Inner Core is a solid ball composed of an element named NiFe. Ni for Nickel and Fe for Ferrum also known as Iron. The Inner Core is about 5000-6000 degrees Celsius. It melts all ...

www.reference.com/science/composition-earth-s-core-99a9e131e2bbd2c8

Earth's core has two parts, a solid iron inner core and a molten outer core, which is composed of a nickel-iron alloy. The outer core begins about 1,800 miles under the crust. It is believed that the core also contains a large amount of gold and platinum, so much that if it was poured onto the surface it would cover the entire planet up to 1 1 ...

www.britannica.com/topic/Core-Within-Earths-Inner-Core-The-2046720

A study published in early 2015 revealed that Earth possesses a second inner Core. A team led by seismologists Tao Wang from Nanjing University and Xiaodong Song from the University of Illinois showed that Earth’s inner core is divided into two layers distinguished only by the polarity differences of the iron crystals found within them. The polarity of the iron crystals of the innermost ...

www.chemistryworld.com/news/chemistry-calculations-reveal-earths-inner-core/...

The inner core also contains silicon, but the crystal lattice of solid iron rejects oxygen atoms. Their best estimate is that, in addition to the iron–nickel alloy, the Earth's outer core ...

study.com/academy/lesson/inner-core-of-the-earth-definition-composition-facts.html

The inner core is the dense center of Earth. Theories on the formation of Earth suggest that the inner core is composed of iron and nickel heated up to a temperature of around 9,800 degrees F.

simple.wikipedia.org/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. The temperature of the outer core ranges from 4400 °C in the outer regions to 6100 °C near the inner core. Outer core. The outer core of the Earth is a liquid layer about 2,260 kilometers thick. It is made of iron and nickel.This is above the Earth's solid inner core and .....