Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

What is true about the mantle of the Earth?

1. It is completely solid and rigid

2. It is less dense than the crust

3. It interacts with both the outer and inner core

4. It has no role in tectonic activities

The correct answer is: It interacts with both the outer and inner core

The mantle of the Earth is a highly significant layer when it comes to geophysical activities and interactions within the planet. One key aspect of the mantle is that it is not entirely solid but is instead composed of semi-solid rock that can flow slowly over time. This characteristic allows it to interact dynamically with both the outer and inner core. The interaction with the outer core is particularly important, as the movement of materials in the mantle can influence the convection currents within the outer core, which are responsible for generating the Earth's magnetic field through the dynamo effect. Furthermore, the mantle plays a critical role in the transfer of heat from the core to the crust, affecting seismic activity and tectonic movements. This interaction is crucial for understanding processes like plate tectonics, where the movement and flow of mantle material can lead to the movement of tectonic plates at the surface. Therefore, the mantle's relationship with both the outer and inner core is an essential aspect of Earth's geodynamics.