Oceanic ridges are underwater mountain ranges formed by tectonic plate movements. They occur at divergent boundaries where two plates are moving apart, allowing magma to rise from the mantle and create new oceanic crust. This process is known as seafloor spreading and is a key feature of the Earth's geology. The Mid-Atlantic Ridge is one of the most well-known oceanic ridges, stretching through the Atlantic Ocean. These ridges are important for understanding plate tectonics and the formation of ocean basins, as they play a crucial role in the recycling of the Earth's crust.