Notation	Name	Description	Status
atmosphere	Atmosphere	Spatial extent from the Earth surface towards but excluding s...	stable
cryosphere	Cryosphere	A component of the Earth system that contains ice, including ...	stable
hydrological	Hydrological	Non-saline, non-atmosphere, non-cryosphere part of the hydros...	stable
ocean	Ocean or Sea	Continuous saline, non-cryosphere part of the hydrosphere.	stable
solidEarth	Solid Earth	Spatial extent of the Earth from the solid surface inwards.	stable
space	Space	Spatial extent above the atmosphere around Earth above the Ka...	stable
terrestrial	Terrestrial	Spatial extent comprised of land masses, normally not covered...	stable