Mid-ocean ridges are underwater mountain ranges formed by tectonic plate movements. They occur at divergent boundaries, where two plates move apart, allowing magma to rise and create new oceanic crust. This process is a key part of the Earth's geology and contributes to the recycling of the planet's crust. These ridges are often characterized by volcanic activity and hydrothermal vents, which support unique ecosystems. The Mid-Atlantic Ridge is one of the most well-known examples, stretching through the Atlantic Ocean and playing a significant role in the formation of new ocean floor.