A prediction for 1.1 billion years in the future:

> The Sun's luminosity has risen by 10%, causing Earth's surface temperatures to reach an average of c. 320 K (47 °C; 116 °F). The atmosphere will become a "moist greenhouse", resulting in a runaway evaporation of the oceans.[65][70] This would cause plate tectonics to stop completely, if not already stopped before this time.[71]

Would somebody be able to ELI5 the connection the Earth's average temperature and plate tectonics?