Tectonic plates move on which layers of the Earth? a a. Crust and upper mantle b. Crust and mantle c. Upper and lower mantle d. Crust, mantle, outer core

Tectonic plates glide gracefully on the upper layer of the Earth, which includes the crust and a portion of the upper mantle known as the asthenosphere. This semi-fluid layer acts like a slippery conveyor belt, allowing the solid plates above to shift and collide over time. Understanding the movement of tectonic plates is crucial, as it helps us predict earthquakes and volcanic activity. For instance, cities located near tectonic boundaries need to invest in earthquake-resistant infrastructure to mitigate potential disasters. It’s like building your house on a riverbank—better be prepared!