Contains basic information on the sky, in simple text and photographs, including what it looks like during day and night, how it changes color, how it shows the weather, and describes its essential characteristics.
Contains basic information on a ocean, in simple text and photographs, including what lives there, where they are found, and describes their essential characteristics.
Contains basic information on a river, in simple text and photographs, including what lives there, where they are found, and describes their essential characteristics.
