Before the exercise, ask students to recall sources of light. Use this worksheet to explain that the brighter the light source, the more space it can light up. Identify the different light sources in the pictures, then check the brighter light source in each pair. The biggest natural source of light is the sun.
Ask your kids how we use water daily. Point out how vital it is to the environment, as many living things couldn't exist without it. Show them this worksheet with kids doing different things that involve water. Ask them to identify what each one is doing, then help them circle the images which show the ways we use the water.