GEOLOGY

Detailed explanation-1: -The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found about 2, 900 kilometers (1, 802 miles) below Earth’s surface, and has a radius of about 3, 485 kilometers (2, 165 miles).

Detailed explanation-2: -Despite the common notion that the earth is spherical or circular, it is in fact an oblate spheroid or geoid.

Detailed explanation-3: -The Earth’s shape is nearly spherical, with a radius of about 3, 963 miles (6, 378 km), and its surface is very irregular. Mountains and valleys make actually measuring this surface impossible because an infinite amount of data would be needed.

Detailed explanation-4: -Earth’s inner core is the innermost geologic layer of planet Earth. It is primarily a solid ball with a radius of about 1, 220 km (760 mi), which is about 20% of Earth’s radius or 70% of the Moon’s radius.

Detailed explanation-5: -The Earth is an irregularly shaped ellipsoid.