"Understanding Earth and space systems"--Cover. Originally approved October 22, 2008. Approval period extended until August 31, 2018. This textbook supports The Ontario Curriculum, Grades 1-8: Science and Technology, 2007.

Why Are Air and Water Important? -- How Do You Know Air Is There? -- What Can Air Do? -- What Do You Know About Water? -- What Can Water Do? -- Is There Water in the Air? -- What Happens to Water in the Air? -- What Makes Rain Fall? -- What Is a Cycle? -- What Is the Water Cycle? -- How Do You Use Water? -- How Can You Use Less Water? -- How Do Air and Water Become Polluted? -- How Can We Keep Air and Water Clean? -- Assessment rubrics for Air and water.