Through this activity, students will understand that the drinking water on Earth is in small amounts and not all countries have equal access to it. That is why we should save it. The activity was performed online through Microsoft Teams.

Objectives:

• to get acquainted with the amount of drinking water on Earth
• understand that we have so little amounts of drinking water
• how polluted water comes to plants and other living things
• to understand that not all people in the world have access to clean drinking water

Discussion with students: What do you think if there is a lot of water on Earth? How much water can we use for our own needs and for drinking? Does everyone in the world have the same access to clean drinking water? What about polluted water? How does it harm us?

Activity 1: In order for the students to understand how water is distributed on Earth, we organized the following small experiment.

Materials: 1000 ml measuring cylinder, pipette, 2 water containers, 1 glass of water, salt.

Procedure:

1. Take a container of water that collects 1000 ml and take a drop from it with a pipette and spray it. It represents water in the atmosphere.

2. Take 973 ml of water and place them in another container of water and put salt in it. It represents the water of the seas and oceans that can’t be used for drinking.

3. If you take another 21 ml of water and put it in another container, and then in the freezer. It represents the frozen water on both poles and in the mountains.

4. Put the rest in water in a glass. It represents the drinking water of the planet.

The students learned that on Earth only a small part of water, about 1% of the total water, can be used for drinking. More than 1 billion people in the world do not have access to clean drinking water. Nearly 2.5 billion people live in very poor hygiene conditions. 25,000 people die every day as a result of water shortages.

After the this activity students watched these two videos:

We had a discussion about what we saw. Students realized that not all countries have access to clean water or water at all. Many countries struggle with keeping goo hygiene and fighting diseases because they don’t have access to clean water.

Activity 2: How polluted water gets into the plants and animals?

Take water in a glass and put paint in it. Such water represents polluted water. Put a plant in it. After a while, you will see that the coloured water will start to enter the plant. Also, the plants transfer the polluted water from the roots through the stems to the leaves. Then these plants will be food for humans and animals, endangering their health.

Conclusion: Polluted water hurts anyone, not just the plants. It hurts the animals and the humans. That is why every time we throw something in the water we should think about how it will affect the environment.

Then students started to think about how we can save water. How we can save water at home, how when we are at school and how we can save water outside. Can we use rainwater to irrigate our garden? They shared their thoughts on a pallet.

Activity 3: Students created posters about how to save water.

Activity 4: On App Inventor we created mobile app with tip on saving water and the posters students made.

Here is how our app looks. The app is simple but the students are very proud of it.