planetary boundary layer is the term we use for the lowest secondary layer of the atmosphere.
planetary boundary layer is the term we use for the lowest secondary layer of the atmosphere.
what term do we use for the lowest secondary layer of the atmosphere?
planetary boundary layer
bullet::::- stratopause – the upper boundary of the stratosphere









































bullet::::- stratosphere – the layer of the atmosphere above the troposphere









































bullet::::- ozone layer – the region of earth's stratosphere that absorbs most of the sun's uv radiation









































bullet::::- tropopause – the boundary of the atmosphere between the troposphere and stratosphere









































bullet::::- troposphere – the lowest layer of the atmosphere









































bullet::::- planetary boundary layer – the lowest part of the atmosphere, directly influenced by contact with the planetary surface









































bullet::::- by air turbulence









































bullet::::- heterosphere – upper parts of the atmosphere in which the component gases are not well mixed
outline of earth sciences
several intended gill sans competitors were developed during the period of its popularity but ultimately did not see mass release. jan tschichold, who would later make extensive use of gill sans while designing books for penguin, created a similar design for an early phototypesetting machine, which was at the time little-used but also since digitised. during the 1930s dutch type designer jan van krimpen, also a friend of morison's, worked on a superfamily named romulus, with serif and humanist sans-serif companion: the sans-serif, with a low x-height, never progressed beyond test proofs. as described above, linotype began work in 1955 on a gill sans competitor, intended to be named 'magnus'. designed by the german type designer hermann zapf with input from british linotype manager walter tracy, the design was ultimately abandoned by 1963 for reasons of lack of manufacturing capacity and changing tastes, although it too reached test proofs.
gill sans