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. More »

The Earth's crust is composed of several minerals and elements, including iron, oxygen, silicon, magnesium, sulfur and nickel. Present in smaller amounts are calcium, aluminum and several other elements. The crust is the... More »

Earth's solid mass is composed of iron, oxygen, silicon, magnesium, sulfur, nickel, calcium and aluminum. These materials, according to, are spread unequally among the planet's three main shells: its core, it... More »

The center of the Earth is called its inner core, which is solid and surrounded by the liquid outer core. The outer core is surrounded by the solid mantle layer, which moves in response to a temperature difference of at ... More »

As of April 26, 2013, a French research team has estimated the temperature of the Earth’s inner core at 10,800 degrees Fahrenheit. This is 1,800 degrees hotter than previous estimates. The newly hypothesized temperature ... More » Science Earth Science Layers of the Earth

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. More » Science Earth Science Layers of the Earth

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... More »