Q1. How do we ensure that water we use is clean?
Rajat has two pet goldfish that he keeps in a tank of water. Every Sunday, he transfers his fish to a small bowl of water, changes the water in the tank and scrubs the bottom of the tank clean. Why do you think he scrubs the bottom of the tank clean?
Q3. Which of the following plays a role in spreading the most amount of usable water to many areas of the Earth?
1 rainfall 2 ponds 3 waterfalls 4 oceans