1. The Wonderful Works of Water

2. Engage:

Every living things on earth depends on water to survive. Humans used water for everyday activities such as cleaning food, washing dishes, taking a shower, etc. Plants need water to grow and make fruits. Water is a home for some creatures and affects the weather as well. More than 60 percent of human body is water. We know that water is an essential substance for survival and I know that there are a lot of questions in your mind right now, but before we come to that let us do this simple activity first.  

HOW MUCH WATER EVAPORATES FROM AN OPEN AQUARIUM, AND WHERE DOES IT GO? (K-4)

Materials:
Aquarium or other large, open container
Measuring cup or graduated cylinder
Water
Masking tape or marking pen
Observation Sheets (on your observation sheet write the following: Date, Amount of Water, Observations, Conclusion)

Safety Precautions: When children work with water, cover their work tables, perhaps with newspaper. Have plenty of paper towels on hand to clean up water spills.

Procedure:
1. Distribute the Observation sheets to the students. Explain that they will use it to record the levels of water in the container or aquarium for one week or two.
2. Direct students' attention to the container or aquarium and explain that they will make observations on the water level in the aquarium or container.
3. Have the students mark the level of water in the container or aquarium by using masking tape or a marking pen.
4. Check the water level each morning. Add enough water to bring to the original level.  
5. Have the students keep a record of how much water was added each day over a period of a week or two.
6. Have the students write their conclusions of what they think as to where the missing water in the container or aquarium went.

Source:
A-220, section IV, Earth and Space Science Activities of Teaching Science as Inquiry Textbook by J. Bass, T. Contant, and A. Carin