The earth is surrounded by a layer of earth and water that we can't see. Mountains and land are made of rocks and soil. Rocks and soil contain salt.
Evaporation is when water goes into the air by changing to a gas.
Water from the sea evaporates. Condensation is when a gas changes to a liquid. Condensation occurs when it rains. The earth is surrounded by a layer of air and water that we can't see. These are salt rocks.