You are presented with the question "he flow of heat into the system causes what?" and the following answer choices: 
- thermal shields
 - thermal detonation
 - thermal expansion
 - Plant growth is reduced
 - chemical reaction
 - Evaporation
 - kinetic energy
 - thermal heat

Now knowing that increasing heat causes thermal expansion and an increase in temperature is the result of the flow of heat into the system, choose the best answer.


 

   thermal expansion      