What is the composition of the Earth? What are inner layers of the earth?

The Earth is composed primarily of iron (32.1%), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), and calcium (1.5%).

The inner layers of the Earth are the inner core, the outer core, the mantle, and the crust.

The inner core is the hottest layer and is composed mainly of iron and nickel.

The outer core is a liquid layer that is composed mainly of iron and sulfur.

The mantle is the thickest layer and is composed mainly of iron, magnesium, and silicon.

The crust is the thinnest layer and is composed mainly of oxygen, silicon, and aluminum.

The Earth also contains trace amounts of other elements, including hydrogen, nitrogen, carbon, and helium.

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