Geological structures are the features and arrangements of rocks and sediments in the Earth's crust. They include formations like faults, folds, and joints, which are created by various geological processes such as tectonic movements and erosion. Understanding these structures helps scientists learn about the Earth's history and the forces that shape our planet. These structures can also influence natural resources, such as oil and minerals, and affect land stability. For example, a fault can lead to earthquakes, while a fold might create a valley. By studying geological structures, we gain insights into both natural hazards and resource management.