Volcanic plains are flat or gently rolling areas formed by the accumulation of volcanic materials, such as lava flows and ash deposits. These landscapes often result from repeated volcanic eruptions that spread lava over large distances, creating a smooth surface. The composition of the lava can vary, influencing the soil quality and vegetation in the area. Many volcanic plains are found near shield volcanoes, which produce low-viscosity lava that flows easily. Examples include the Columbia River Basalt Group in the United States and the Deccan Traps in India. These regions can be rich in minerals and support diverse ecosystems.