The field of energy is wide and interesting due to it can be expressed by differents way.
The thermal energy is associated like internal energy of the atoms or molecules of a substance. The transfer of thermal energy as heat can take place via convection.
Convection via is the transfer of thermal energy due to the motion of the substance that contains the thermal energy.
And the significant amount of volume can be differed by its solitude
It would be endothermic because the log is in the system.
I'm not sure but i would say C.storing the heat energy.
Hydrogen, hydrogen ion (H+) is associated with acids
