Suppose you were doing an experiment outside on a sunny day. You find the temperature of some sand in 28 degrees. You also find the temperature of some water is 25 degrees. why would there be a difference between the temperature?

The temperature is different because of the molecular make up of sand and water. Sand's atoms are much closer together because it is a solid so they bump into each other causing the substance, in this case sand, to heat up and stay heated longer. Water's atoms are much more spread out than that of sand so it takes longer for it to warm up because the atoms are not bumping into each other as much.