Dynamic planet -- Restless earth -- What is a tsunami? -- Wave power -- Walls of water -- A drowned world -- Recovery begins -- Tsunami warnings -- Earth shakes -- Surviving a quake -- Mighty volcanoes -- Rivers of fire -- Landslides and avalanches -- Earth's atmosphere -- Wild weather -- Hurricane force -- Battling the wind -- Hurricane Katrina -- Twisting tornadoes -- Flood alert -- Raging waters -- Drought and famine -- Wildfire -- Fighting fires -- Climate change -- Unnatural disasters -- Infectious diseases -- Epidemic -- Future disasters -- Did you know? -- Timeline -- Find out more.