GEOLOGY

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. Outer Core 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 of the Earth is a liquid layer about 2, 261 km thick composed of iron and nickel which lies above the Earth’s solid inner core and below its mantle. Its outer boundary lies approximately 2, 890 km (1, 800 mi) beneath the Earth’s surface.

Detailed explanation-3: -So the Earth’s core is liquid because it’s hot enough to melt iron, but only in places where the pressure is low enough. As the Earth continues to age and cool, more and more of the core becomes solid, and when it does, the Earth shrinks a little bit!

Detailed explanation-4: -The mantle is the mostly solid bulk of Earth’s interior. The mantle lies between Earth’s dense, superheated 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.