1. Convection Currents:
- The Earth's mantle, located beneath the crust, is composed of solid but relatively weak rocks. Heat from the Earth's core causes the mantle material to rise and sink in a process known as convection.
- As the hot mantle material rises, it cools and becomes denser, causing it to sink back down. This creates a continuous cycle of rising and sinking mantle material, forming convection currents.
- The movement of these convection currents drags the tectonic plates that are embedded in the mantle. The plates move as they are pushed by the rising mantle material and pulled by the sinking material.
2. Slab Tectonics (or Slab Pull):
- Subduction zones are areas where one tectonic plate descends beneath another. As one plate sinks into the Earth's mantle, it pulls the rest of the plate along with it.
- The weight of the subducting plate, along with the gravitational forces acting on it as it descends, creates a "slab pull" force that contributes to the movement of the tectonic plates.
The combination of convection currents within the mantle and slab tectonics provides the driving forces for plate tectonics, resulting in the movement of tectonic plates across the Earth's surface.
