What is Earth's innermost layer?

What is Earth's innermost layer?

• A. The outer core
• B. The core
• C. The mantle
• D. The crust

Answer: (B)

Earth is built in layers: a crust on the outside, a thick mantle beneath it, and a core at the center. The core has two parts—the inner core and the outer core. The innermost part is the inner core, which is solid iron-nickel, but that option isn’t listed. Among the given choices, the central region of Earth is described as the core, making it the best answer. The outer core lies outside the inner core, while the mantle and crust are farther from the center. So the core is the central, innermost zone described by the option.

Earth is built in layers: a crust on the outside, a thick mantle beneath it, and a core at the center. The core has two parts—the inner core and the outer core. The innermost part is the inner core, which is solid iron-nickel, but that option isn’t listed. Among the given choices, the central region of Earth is described as the core, making it the best answer. The outer core lies outside the inner core, while the mantle and crust are farther from the center. So the core is the central, innermost zone described by the option.