1. Heat from the Earth's Core: The Earth's core is extremely hot, and this heat is transferred outwards.
2. Convection Currents: This heat causes the semi-solid mantle rock to become less dense and rise. As it rises, it cools and becomes denser, sinking back down. This continuous cycle of rising and sinking creates convection currents.
3. Drag on the Plates: These convection currents drag the tectonic plates along with them. The plates are like rafts floating on a viscous fluid, moving slowly but constantly.
4. Plate Boundaries: Where these plates meet, their interaction causes a variety of geological phenomena:
* Convergent Boundaries: Plates collide, resulting in mountain ranges, volcanoes, and earthquakes.
* Divergent Boundaries: Plates move apart, creating new crust and mid-ocean ridges.
* Transform Boundaries: Plates slide past each other, causing earthquakes.
In summary:
* Heat from the Earth's core drives convection currents in the mantle.
* These currents drag the tectonic plates, causing them to move and interact at their boundaries.
* This dynamic process is responsible for the geological features and activity we see on Earth's surface.
