The topic that is not included in the study of physical geology is the study of the human impact on the Earth's systems.

Here's why:

* Physical geology focuses on the Earth's physical components and processes. This includes topics like rocks, minerals, plate tectonics, volcanoes, earthquakes, erosion, and the formation of landforms.

* Human impact falls under the domain of environmental geology or geochemistry. These branches explore how human activities affect the Earth's systems and resources, including pollution, climate change, and resource management.

While physical geology provides a foundation for understanding the Earth, it doesn't delve into the specific consequences of human actions on the planet.