Includes index.

Planet earth -- Welcome to plant earth -- How did earth form? -- Continents adrift -- What is plate tectonics? -- What makes mountains? -- Mountains closeUP -- What causes erosion? -- What makes rivers? -- What shapes canyons? -- What is a desert? -- Land carved by glaciers -- What makes caves? -- What are lakes? -- What is a volcano? -- Where do volcanos form? -- What comes out of a volcano? -- Mount St. Helens, 1980 -- Mount St. Helens closeUP -- Pompeii, A.D. 79 -- Living with volcanoes -- What is an earthquake? -- Measuring an earthquake -- San Francisco, 1906 -- Kobe, 1995 -- Kobe closeUP -- What are rocks? -- What is a mineral? -- Amazing crystals -- What are gemstones? -- Diamonds: king of minerals -- What is gold? -- Fossil fuels -- What is the ocean? -- The ocean floor -- Currents & tides -- Currents closeUP -- What are waves? -- Exploring the ocean -- Finding the Titanic! -- What is an iceberg? -- The ocean's resources -- What is the atmosphere? -- Why does the sky change color? -- The water cycle -- What are clouds? -- Rain, snow, and hail -- What are floods? -- Energy from the sun -- Where does wind come from? -- What is weather? -- Predicting the weather -- What is lightning? -- What are hurricanes? -- Hurricanes closeUP -- What is a tornado? -- Tornadoes closeUP.

Accelerated Reader AR MG 7.5 2 40237.