This is our planet, the Earth. It is an remarkable, ever-changing world, full of natural wonders.But there's more to Earth than this, much more.Because our planet is unique in the solar system, Perhaps even in the universe.4.5 billion years have made it a world of extraordinary landscapes and a home to life.My name is Iain Stewart.And I want to show you how our planet works.I'm going to explore volcanoes. They're terrifyingly destructive.But they're also the most fundamental force on the planet.Volcanoes are part of a global system that continually reshapes our worldThey hold the key to the origins of life on Earth.They saved the planet from possibly the biggest crisis it's ever faced.And they've even formed a partnership with life that keeps our planet habitable.
