You are presented with the question "how is salt produced?" and the following answer choices: 
- flow of electrons
 - solid, liquid, gas
 - chemical messengers
 - Solutions
 - Physical weathering
 - It gets heated up
 - near the shoreline
 - heating water

Now knowing that heating salt water causes the water to evaporate while the salt remains and salt is produced by the evaporation of sea water, choose the best answer.


 

        heating water 