You are presented with the question "A solution is formed when limestone is dissolved in what?" and the following answer choices: 
- old caves
 - habitats
 - body water
 - rainfall
 - calcite
 - sandy shores
 - evaporation
 - ocean water

Now knowing that asolution is formed by one substance being dissolved in another substance and another dissolved substance in ocean water is a type of rock called limestone , choose the best answer.


 

        ocean water 