Join the editors of time and the world's most acclaimed nature photographers on a breathtaking journey of discovery to Planet Earth. Here is a remarkable and illuminating portrait of mankind's home planet in all its staggering diversity, beauty and mystery, from the splendor of the aurora borealis to the oddities of bizarre life-forms at home in Earth's most extreme environments. Here are natural wonders both massive and minute, ranging from the vast mechanisms of plate tectonics to the intricate details of animals whose bodies are adapted to mirror their environment.Time explores this enormous subject by following the ancient Greek division of the world into a series of spheres: atmosphere, pedosphere, biosphere, hydrosphere, cryosphere and geosphere.