Science Experiments - Water on Earth
This activity demonstrates how much of the earth's water is fresh water.
Materials:
2-liter plastic bottle, salt, green food coloring, yellow corn oil, water
1. Put a few drops of green food coloring into the bottom of the plastic bottle.
2. Pour water into the container until just past the base of the neck.
3. Add 2-3 tsp. of salt to the green water. Explain that this water represents ocean water which is salty and cannot be used to drink or water fresh water plants.
4. Slowly pour 60ml of corn oil on top of the salt water in the 2 liter bottle. Explain that the corn oil represents 3% of the fresh water that is available on Earth. This is all the fresh water that is available for drinking, plant use and all of our other fresh water needs.
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