Which term refers to Earth's innermost layer?

Which term refers to Earth's innermost layer?

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

Answer: (A)

The term for Earth's innermost layer is the core. It sits at the center, beneath the mantle and crust, and is mainly iron and nickel. The core is divided into a solid inner core and a surrounding liquid outer core. Seismic data from earthquakes reveal this structure: S waves cannot travel through liquids, and P waves change speed and direction at the core boundary, which points to a dense central region. That central, deepest part is what we call the core. The other terms don’t refer to Earth's innermost layer; they describe different concepts or structures elsewhere in geology.

The term for Earth's innermost layer is the core. It sits at the center, beneath the mantle and crust, and is mainly iron and nickel. The core is divided into a solid inner core and a surrounding liquid outer core. Seismic data from earthquakes reveal this structure: S waves cannot travel through liquids, and P waves change speed and direction at the core boundary, which points to a dense central region. That central, deepest part is what we call the core. The other terms don’t refer to Earth's innermost layer; they describe different concepts or structures elsewhere in geology.