Here's why:
* The mantle is a semi-solid layer: It's hot enough to be partially molten, allowing for the movement of rock.
* Heat from the core: The Earth's core is extremely hot, and this heat transfers into the mantle.
* Density differences: The hotter, less dense material rises, while the cooler, denser material sinks. This continuous cycle of rising and sinking creates convection currents.
These convection currents are the driving force behind plate tectonics, which shapes the Earth's surface through processes like mountain building, volcanic eruptions, and earthquakes.
