1. Investigating and analyzing rock formations: Geologists study the composition, structure, and history of rocks. This involves fieldwork where they collect rock samples, map geological formations, and analyze the data in a lab. They use this information to understand the Earth's history, past environments, and the processes that formed the rocks.

2. Evaluating and managing natural resources: Geologists play a crucial role in finding and assessing natural resources like oil, gas, and minerals. They use their knowledge of geology to identify areas with potential deposits, conduct exploratory drilling, and ultimately help manage the extraction and utilization of these resources.

These are just two examples, and geologists have a wide range of responsibilities depending on their specialization. Other tasks include:

* Assessing environmental risks: Analyzing soil and water samples, studying the impact of natural hazards (like earthquakes or landslides), and recommending mitigation strategies.

* Studying the Earth's history: Analyzing fossils, interpreting sedimentary layers, and understanding climate change over time.

* Working in academia and research: Conducting scientific research, teaching geology, and publishing research papers.