GIA Diamonds Do Good (DDG) Practice Test

The three main components of the Earth are indeed the Crust, Mantle, and Core.

The Crust is the outermost layer of the Earth, consisting of solid rock and minerals. It is relatively thin compared to the other layers and is where we find all terrestrial life, including landforms, soil, and bodies of water.

Beneath the crust lies the Mantle, which extends to a depth of about 2,900 kilometers (1,800 miles). The mantle is primarily composed of silicate rocks that are richer in magnesium and iron compared to the crust. It plays a crucial role in the movement of tectonic plates and is involved in volcanic activity and continental drift.

The Core is the innermost layer of the Earth, divided into the outer core and inner core. The outer core is liquid, composed mainly of iron and nickel, and generates the Earth's magnetic field through its motion. The inner core, on the other hand, is solid and extremely hot, also composed primarily of iron and nickel.

This classification helps in understanding the Earth's structure and is fundamental in fields such as geology and geophysics. Other options fall short by either misrepresenting the main layers or introducing terms that pertain to specific parts or