Direct Inquiry Direct Inquiry Explore How can you make fresh water from salt water?
Materials Needed Salt water and spoon Small cup and bowl Plastic wrap and tape Marble
What To Do Step 1: Pour 5 spoonfuls of salt water into a bowl. Set a small cup in the middle of the bowl. Cover the bowl with plastic wrap. Helpful Hint... Tape the plastic wrap to the bowl. The plastic wrap should not touch the small cup.
What To Do Step 2: Place in sunlight for several hours. Step 3: Remove the marble, plastic wrap, and cup. Put the bowl and cup in a warm place. Let the water evaporate for about 3 days.
What To Do Step 4: Observe the bottom of the cup.
Explain Your Results 1. Communicate: What did you find in the bottom of each container? Explain. 2. Predict: Think about the variables that affect evaporation. How can you speed up evaporation? Describe how you could test your prediction.
Activity Rubric Scoring Criteria 1 2 3 4 Student followed directions to perform tasks. Student observed the cups after 3 days. Students communicated their observation. Student predicted how the evaporation could be sped up. Student described how the prediction could be tested.
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