Final answer:
Natural changes like hurricanes and volcanoes are categorized under 'Physical Systems' in geography. This field includes the study of processes shaping the Earth's physical aspects and the impact of such events on the environment.
Step-by-step explanation:
Natural changes such as hurricanes and volcanoes belong to the category of Physical Systems in geography. This category examines the processes that shape the physical environment, including weather patterns and tectonic activities.
According to the references provided, such as WG.3C, which describes how physical processes like hurricanes and volcanoes affect different spheres of Earth, it's clear that these events are part of the technological forces and weather conditions that impact the physical landscape. WG.4B expands on this, explaining that physical geography focuses on natural phenomena such as landforms and the physical processes that cause their development.