How to understand the research object of geography from the viewpoint of system theory? Excuse me, how to answer?

The idea of system science is a powerful weapon in geographical science research. Practice has proved that it is a very successful geographical system to study geographical things and their processes with the idea of "system theory", also known as geographical system, which refers to an organic whole composed of various geographical elements with specific functions on the earth's surface. According to its scope and scale, it can be divided into different levels, such as intercontinental system, national or large regional system, regional system and community system. According to its nature, it can be divided into natural regional system, economic regional system, humanistic regional system and compound regional system. Every regional system is an open system, which is inextricably linked with the external environment. The function of regional system depends on its own content structure and external input. The structure of any regional system has the characteristics of integrity, comprehensiveness, relevance, hierarchy, dynamics (variability) and openness.