GEOLOGY

Detailed explanation-1: -It is made up of around nine-tenths iron and nickel [1]. The inner core is about the size of the moon. It is very hot (>5, 000°C) and is solid due to the extremely high pressure from the weight of the material above it.

Detailed explanation-2: -Iron, nickel, and other heavy metals like gold, are what makes up the core of the earth because they are the heaviest of the metals and so sank toward the center of the earth.

Detailed explanation-3: -The crust of the Earth has some permanent magnetization, and the Earth’s core generates its own magnetic field, sustaining the main part of the field we measure at the surface. So we could say that the Earth is, therefore, a “magnet."

Detailed explanation-4: -The outer core lies between Earth’s solid inner core and its mantle. It is a molten metal layer that is about 2400km thick.