A geologist is a scientist who studies the Earth, its materials, and the processes that shape it over time. They examine rocks, minerals, and fossils to understand the planet's history and structure. Geologists often work in the field, collecting samples and observing natural formations, as well as in laboratories analyzing their findings. Geologists play a crucial role in various industries, including mining, oil and gas exploration, and environmental protection. Their expertise helps in locating natural resources, assessing geological hazards like earthquakes and landslides, and understanding climate change impacts on the Earth’s systems.