Which sequence lists the four major layers of Earth's interior from outermost to innermost?

Which sequence lists the four major layers of Earth's interior from outermost to innermost?

• A. Mantle, Crust, Outer Core, Inner Core.
• B. Crust, Mantle, Outer Core, Inner Core.
• C. Crust, Core, Mantle, Inner Core.
• D. Inner Core, Outer Core, Mantle, Crust.

Answer: (B)

Think about how Earth’s insides are arranged from the surface inward. The outermost layer is the crust, a thin, rigid shell. Beneath that sits the mantle, which is hot and capable of slow flow that drives plate tectonics. Under the mantle lies the outer core, a liquid layer of iron and nickel whose swirling movements generate Earth’s magnetic field. At the center is the inner core, a solid sphere formed under enormous pressures. So the sequence from outside to inside is crust, mantle, outer core, inner core. The other sequences mix up the order or lump the core layers together, which doesn’t match how these layers stack beneath our feet.

Think about how Earth’s insides are arranged from the surface inward. The outermost layer is the crust, a thin, rigid shell. Beneath that sits the mantle, which is hot and capable of slow flow that drives plate tectonics. Under the mantle lies the outer core, a liquid layer of iron and nickel whose swirling movements generate Earth’s magnetic field. At the center is the inner core, a solid sphere formed under enormous pressures.

So the sequence from outside to inside is crust, mantle, outer core, inner core. The other sequences mix up the order or lump the core layers together, which doesn’t match how these layers stack beneath our feet.