Shield volcanoes are large, broad structures formed by the eruption of low-viscosity lava that can flow over great distances. Their gentle slopes resemble a warrior's shield, hence the name. These volcanoes typically produce basaltic lava, which is less explosive than other types, leading to more frequent but less violent eruptions. Some well-known examples of shield volcanoes include Mauna Loa and Kilauea in Hawaii. These volcanoes play a crucial role in shaping the landscape and can create extensive lava fields. Their eruptions can also provide valuable insights into volcanic activity and the Earth's geological processes.