A "fault line" is a geological term that refers to a fracture or zone of weakness in the Earth's crust where tectonic plates meet. These lines are significant because they are often the sites of earthquakes, as stress builds up along the fault until it is released suddenly.
Fault lines can vary in length and depth, and they can be found all over the world. Notable examples include the San Andreas Fault in California and the North Anatolian Fault in Turkey. Understanding fault lines is crucial for assessing earthquake risks and implementing safety measures in affected regions.