Geological boundaries are the distinct lines or zones that separate different geological formations or rock types. These boundaries can indicate changes in the Earth's crust, such as where one type of rock meets another, or where tectonic plates interact. Understanding these boundaries helps geologists study the Earth's history and the processes that shape its surface. There are three main types of geological boundaries: convergent, divergent, and transform. Convergent boundaries occur where plates collide, often forming mountains or causing earthquakes. Divergent boundaries form where plates move apart, creating new crust, while transform boundaries slide past each other, leading to fault lines.