What Are the Layers of the Earth Called?

The four layers of the Earth are called the inner core, the outer core, the mantle and the crust. In addition, there are two different types of crust. The continental crust is the part that is under land, and the oceanic crust is the part under the oceans.

The inner core

The inner core is the center of Earth's sphere, and it is also the hottest part, reaching temperatures of more than 9,900 degrees Fahrenheit. It is located 3,219 miles from the Earth's surface, and makes up 1.7 percent of the Earth's mass. It is composed of iron and nickel.

The outer core

The outer core is the next layer and surrounds the inner core. It is 1,806 miles from the Earth's surface and makes up 30.8 percent of the Earth's mass. Like the inner core, it is a molten liquid made mostly of iron and nickel. At 6,700 F, temperatures are slightly cooler in the outer core than the inner core.

The mantle

The mantle is the largest layer, making up 67 percent of the Earth's mass. It starts 6 miles from the surface and runs to a depth of 1,806 miles. It is made of magma, which is hard rock close to the top, and molten rock closer to the outer core.

The crust

The crust is the outer layer . It is also the smallest part, making up just 0.5 percent of the Earth's mass. It runs to a depth of 31 miles in some places.