Question

Sophia was studying with Maalik about the layers of the Earth. They were given several different statements about the layers.

Which statement about the layers would they identify as correct?

The outer core is less than 70 km in thickness.
The crust assists in forming Earth’s magnetic field.
The mantle is denser than the crust.
Pressure increases when moving from the core to the crust.

Answer 1

Correct: The mantle is denser than the crust.

Why the others are wrong, briefly:
- The outer core is far thicker than 70 km (about 2,200 km).
- Earth’s main magnetic field is generated by the convecting liquid outer core (the crust only produces small local magnetic anomalies).
- Pressure increases with depth, so it increases from the crust down toward the core, not from the core to the crust.