This book not only answers this compelling question, it explains why people once thought Earth was flat, what Earth is made of, the cause of Earth's seasons, and how Earth moves around in space. With gravity, the Sun, and specially designed diagrams as tour guides, students can get comfortable with the unique features of our planet.

What is earth? -- What is earth made of? -- How was earth formed -- Why is the earth round? -- Why did people believe earth was flat? -- How does earth get around? -- How is earth more than a sphere? -- What makes earth's seasons? -- Why do scientists study earth? -- How can you find your way on earth?.