The answers are;
- The mineral formed through evaporation
- The mineral crystallized from dissolved elements and compounds
As the water of the lake evaporates due to high sunlight intensity, the lake waters become saturated because the reduced volume of the lake still dissolves the same amount of mineral elements. The minerals begin to crystallize and precipitate to form salt rocks. As the waters of the lake shores recede due to evaporation, the salty rocks are exposed.
