This document defines and describes different types of landforms including plains, plateaus, valleys, mountains, hills, mountain ranges, volcanoes, islands, and peninsulas. Plains are wide, flat areas of low land while plateaus are flat high lands. Valleys are low areas surrounded by hills or mountains. Mountains are steep high lands and hills are lower and smoother high lands. Mountain ranges are rows of connected mountains. Volcanoes are mountains with craters that erupt. Islands are areas of land surrounded by water and peninsulas extend out from land into water but are not completely surrounded.