The core-mantle boundary (CMB) is the interface between the Earth's outer core and the overlying mantle. It is located at a depth of about 2,900 kilometers (approximately 1,800 miles) below the Earth's surface. This boundary marks a significant transition in the Earth's composition and physical state. The outer core is composed mainly of liquid iron and nickel, along with lighter elements, while the mantle is primarily made up of solid silicate minerals.
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