There are several major types of maps, including climate maps, political maps, economic or resource maps, physical maps, street maps, road maps, topographic maps, and thematic maps. Climate maps portray climate conditions, political maps show state and natural boundaries as well as city locations, and economic maps denote natural resources and economic activities through colors and symbols. Physical maps portray landscape features such as mountains, lakes, and rivers using colors to represent elevations. Street maps and road maps indicate highways with different colors. Topographic maps use contour lines to show terrain elevations. Thematic maps focus on a particular theme rather than natural features.