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.

Let's evaluate each of the statements about the Earth's layers to determine which one is correct: 1. **The outer core is less than 70 km in thickness.** - **Incorrect.** The outer core is actually about **2,200 kilometers** thick. 2. **The crust assists in forming Earth's magnetic field.** - **Incorrect.** The Earth's magnetic field is primarily generated by the movement of the **liquid outer core**, which is composed mainly of iron and nickel. The crust does not play a significant role in this process. 3. **The mantle is denser than the crust.** - **Correct.** The mantle has a higher density, typically ranging from **3.3 to 5.6 g/cm³**, compared to the crust, which has an average density of about **2.7 g/cm³** for continental crust and slightly higher for oceanic crust. 4. **Pressure increases when moving from the core to the crust.** - **Incorrect.** Pressure actually **decreases** as you move outward from the core toward the crust. Pressure increases as you go deeper into the Earth, moving from the crust toward the core. **Therefore, the correct statement is:** **"The mantle is denser than the crust."**