The two main branches of geography are physical geography and human geography, and other branches it seems to depend as there are a number of different subfields. Two of the biggest are environmental geography and cartography, for example.
Explanation:
Cartography involves the actual charting and mapping of physical space which has become more advanced and detailed with technological changes. Gone are the days of having to rely on navigation skills and the eyes of a cartographer for mapping the far away reaches of the world. Environmental geography concentrates on the spatial aspects of human interactions in their immediate environment. There is also a focus on the consequences of this interaction and how to avoid certain activities that have an impact on the environment.
Air Mass is a volume of air characterized by temperature and water vapor content and stretched for 100 kilometers.
Classified according to the latitude and the source regions, like cold air mass found in cooler polar regions and warm masses form over the hotter and drier regions of continents and maritime air mass are found at the seas and oceanic masses.
As air mass differs based on there densities they have humid and temperature conditions and can be modified in various ways, an increase or decrease of temperature is also affected by the large scale environmental conditions.