Linked from
The 9 pages that link to Troposphere, each with the reason it gives.
Atmosphere of EarthBroader topic: Nearly all familiar weather takes place in this lowest layer.
Cirrus cloudNarrower topic: Most cirrus forms in the upper troposphere, above lower cloud families.
MesosphereRelated: It is the atmospheric layer beneath the stratosphere and mesosphere.
Cirrostratus cloudNarrower topic: Cirrostratus forms in the troposphere’s cold upper region.