The document describes the different biomes found on Earth. It divides the planet into three main areas: land (22%), oceans and seas (71%), and freshwater (7%). It then discusses the key characteristics of various terrestrial biomes, including tundra, taiga, deciduous forests, steppe, savanna, tropical rainforests, and deserts. It also summarizes the main aquatic biomes of oceans and seas, which include the pelagial, plankton, nekton, and benthos zones, as well as freshwater biomes found in standing and flowing water ecosystems.