SOLAR SYSTEM

Detailed explanation-1: -The core is made of two layers: the outer core, which borders the mantle, and the inner core. The boundary separating these regions is called the Bullen discontinuity. The outer core, about 2, 200 kilometers (1, 367 miles) thick, is mostly composed of liquid iron and nickel .

Detailed explanation-2: -The outer core is the liquid largely iron layer of the earth that lies below the mantle. Geologists have confirmed that the outer core is liquid due to seismic surveys of Earth’s interior.

Detailed explanation-3: -The mantle is the mostly solid bulk of Earth’s interior. The mantle lies between Earth’s dense, super-heated core and its thin outer layer, the crust. The mantle is about 2, 900 kilometers (1, 802 miles) thick, and makes up a whopping 84 percent of Earth’s total volume.

Detailed explanation-4: -The outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to that of the inner core.