Process is continuing today, although at a much slower rate. Earth is the only planet with an atmosphere composed of Nitrogen, Oxygen, Carbon Dioxide, and Water Vapor. Earth is the only planet that has a hydrosphere, a region on the surface where water can exist in liquid, vapor and solid forms. The biosphere exists because of the Earth's temperature, and because of the atmosphere. Oxygen is present in the atmosphere because of the biosphere.
Earth is the only planet with a regolith.
Regolith is a thin covering of loose rock debris that has formed as a result of a process called weathering. Weathering is the mechanical and chemical response of interactions between the rocks of the Earth and its hydrosphere, atmosphere, and biosphere. While other planets have something resembling regolith, most formed as a result of meteorite impacts which have mechanically broken the surface into loose fragments of rock. The Earth is unique in that other processes have occurred to produce a more varied regolith . The Earth has a radius of about 6371 km, although it is about 22 km larger at equator than at poles.