 Gutenberg discontinuity

The Gutenberg discontinuity, also known as the Gutenberg layer or the Gutenberg limit, is a significant boundary within the Earth's interior that separates the Earth's mantle from the outer core. It is located at a depth of about 2,900 kilometers (approximately 1,800 miles) beneath the Earth's surface. At this boundary, there is a notable change in the physical and chemical properties of the materials.