PLANET EARTH. Earth in time -- Big bang -- Birth of earth -- Earth in space -- Earth and moon -- Evolving earth -- Life story -- Meteorites -- Ice ages -- Inhabited earth -- ROCKY EARTH. Revealing earth -- Earth's structure -- The crust -- Tectonic plates -- Spreading rifts -- Colliding continents -- The inner layers -- Magnetic earth -- Earthquakes and tsunamis -- Volcanoes -- Ash blanket -- Stratovolcanoes -- Geysers and hot springs -- The rock cycle -- Minerals -- Weathering and erosion -- Living geology -- The White Cliffs of Iturup -- Fossils -- BLUE PLANET. Earth's water -- The water cycle -- Glaciers -- Cool cavern -- Rivers -- Waterfalls -- Lakes -- Caves -- Ocean waters -- WEATHER AND CLIMATE. Weather or climate? -- Atmospheric circulation -- The causes of climate change -- Greenhouse gases -- The effects of climate change -- Weather -- Clouds -- Storms -- Tornadoes -- Dust storm -- Floods -- Forest fires -- LIFE ON EARTH. Earth's biomes -- Arctic tundra -- Chilly climes -- Forests -- Temperate forests -- Tropical rainforests -- Temperate grasslands -- Tropical grasslands -- Deserts -- Wetlands -- Coastal habitats -- Diving down -- The open ocean -- Ecosystems -- Threats to habitats -- Plants under threat -- Animal conservation -- EARTH AND US. Humans on earth -- Farming -- Living with the land -- Population -- Sustainable cities -- Connected world -- Energy -- Globalization -- Industrial zone -- Coastal living -- Tourism -- Pollution -- Building the future -- EARTH'S CONTINENTS. Continents and oceans -- North America -- South America -- Europe -- Africa -- Asia -- Cascade of pools -- Australia and Oceania -- Antarctica -- The Arctic -- Countries of the world.