Which term refers to Earth's innermost layer?

Which term refers to Earth's innermost layer?

• A. Core
• B. Cratons
• C. Crown angle
• D. Cross working

Answer: (A)

The innermost layer of Earth is the core. It lies beneath the mantle and crust and is itself divided into a solid inner core and a liquid outer core. This deepest region is defined by its composition (mostly iron-nickel) and its distinct physical states, with the outer core’s liquid iron flow driving Earth’s magnetic field. The other terms don’t describe Earth's interior: cratons are ancient, stable pieces of the crust, crown angle isn’t a geologic layer term, and cross working isn’t related to Earth’s internal structure.

The innermost layer of Earth is the core. It lies beneath the mantle and crust and is itself divided into a solid inner core and a liquid outer core. This deepest region is defined by its composition (mostly iron-nickel) and its distinct physical states, with the outer core’s liquid iron flow driving Earth’s magnetic field. The other terms don’t describe Earth's interior: cratons are ancient, stable pieces of the crust, crown angle isn’t a geologic layer term, and cross working isn’t related to Earth’s internal structure.