When a cooler object touches a warmer object , thermal conduction occurs, and thermal conductivity varies with sediment type. Given these facts, when a cooler object touches a warmer object, conductivity varies with what among the following options:
- heat energy
 - flow of electrons
 - voltage
 - activation energy
 - Electrical energy
 - sediment type
 - energy barrier
 - friction


 

      sediment type   