You are presented with the question "What, if heated, evaporates while salt remains?" and the following answer choices: 
- hydration
 - Energy.
 - spring
 - Solar energy
 - seawater
 - salinity
 - Solutions
 - energy

Now knowing that heating salt water causes the water to evaporate while the salt remains and most of Earth's water is salty seawater, choose the best answer.


 

     seawater    