Answer:I learned that a mixture of sand and water is the best example of a heterogeneous mixture. A mixture in which the composition is not uniform throughout the mixture then it is said to be a heterogeneous mixture. why cant water dissolve sand you may ask? well water can only separate polar particles, and SiO₂ isn't polar, so water just doesn't have the energy to break all those bonds. this is a 3 sentence #carryonlearning