A solution is formed by one substance being dissolved in another substance.
Most substances can exist as a solid, liquid or gas.
A solution is formed by a solid, liquid, or gas being dissolved in another solid, liquid, or gas.
a solution is formed when one of these gets dissolved into another one of these

(1) Calcium carbonate
(2) Condensation
(3) near the shoreline
(4) solid, liquid, gas
(5) a hydraulic system
(6) evaporation
(7) Light passing through water
(8) chemical changes