The document discusses temperature zones on Earth. According to ancient Greeks, there are three temperature zones based on latitude: the tropical zone between the Tropics of Cancer and Capricorn which has a consistent high temperature; the temperate zone between 23.5-66.5 degrees latitude which has seasonal variations; and the frigid zone near the poles which has consistently low temperatures. However, Soupan proposed determining temperature zones based on isotherms which take into account additional factors like continents, oceans, winds and ground surface.