Is the water drinkable? Reseach of the macroworld of the water we drink.

Second grade students of Andreadis School searched if the water that we can find in a river or lake is clean enough to drink. They wrote down and categorized all the rubbish found in rivers and lakes and found information about how much time does it take for every material to be disolved by water. They tried to clean the water and searched wether there are rubbish not visible by eyes in the water. They learned about macroworld and microworld.