Mountains, valleys, plains, plateaus, snowy coasts, mountain ranges, and volcanoes are some of the different types of landscapes that make up Earth's surface. Mountains are natural elevations of the earth, plateaus are large flat high areas, and plains are extensive low-lying areas suitable for agriculture. Valleys are low-lying areas surrounded by mountains with rivers running through them. Snowy areas are mountains topped with snow, and volcanoes are mountains that erupt hot lava and gases. Mountain ranges are series of connected mountains.