1. Physical Geology: This focuses on the processes that shape the Earth, including:

* Plate tectonics and its impact on the Earth's surface

* Weathering and erosion

* The formation and movement of rocks and minerals

* Geological hazards like earthquakes, volcanoes, and landslides

2. Historical Geology: This focuses on the history of the Earth, including:

* The formation and evolution of the Earth and its life forms

* The use of fossils to understand past environments

* The study of rock formations and their chronological order

* The development of the Earth's continents and oceans over time

These two areas are closely intertwined, as understanding the processes of physical geology is essential to interpreting the history revealed by historical geology.