Two solid blocks are heated to the temperatures shown. The blocks are placed so they touch.

Which diagram shows the direction heat will flow
89*C > 80*C
89*C < 89*C
89*C no heat flow 89*C

The diagram that shows the direction heat will flow is the first option: 89°C > 80°C. Heat flows from a higher temperature to a lower temperature, so in this case, heat will flow from the block at 89°C to the block at 80°C.