This simple experiment shows you what happens when pollutants get into the water system.

Materials:

• Celery stalk
• Two white flowers
• Food coloring
• Three glass jars
• Knife
• Water

Pour about two inches of water into each jar and add several drops of food coloring. Trim the flower and celery stems and stand them in the colored water. Let them stand for several hours or overnight. You will see that as the plant drinks the water it also drinks the pollution (i.e. the food coloring) that is in it.