purity has a yes troposphere on the quantity / land good / land good / quail
sky has clouds sky is higher_than_land. perfect_vacuum has no_air earth has more_water_than_land cosmic_dust is cloud. asterism is celestial_region. cykling is healthy_way_to_travel. earths_atmosphere has nitrogen celestial_equator is great_circle. world has more_water_than_dry_land