Question

three differences between groundwater and rainwater

Answer 1

1st of all it is underground water not ground water and the differences are rain water the purest form of water , it comes from clouds , it cannot be possible without water cycle.
underground water found under the earth's crust,it is hard water means it contains calcium and other substances, it cannot be consumed without purification

Answer 2

the water which is store in our ground is cooled ground water while the water which comes from cloud is cooled rain water