Question

which statement about earth’s core helps explain earth’s magnetic field?
○ earth’s core is composed of magnets.
○ earth’s core is composed of iron and nickel.
○ the outer core is solid.
○ the inner core is liquid and moving.

Explanation:

• Option 1: Earth’s core isn’t made of magnets. Natural magnets don’t form the core.
• Option 2: Earth’s core (inner and outer) has iron and nickel. The outer core is liquid, and the movement of these conductive metals (due to Earth’s rotation and convection) generates the magnetic field via the dynamo effect.
• Option 3: The outer core is liquid, not solid. The inner core is solid.
• Option 4: The inner core is solid; the outer core is liquid and moving.

Answer:

B. Earth’s core is composed of iron and nickel.