map of south america showing charles darwin’s voyage around the world on the hms beagle, part 1 of 3 tropic zone connecting maps - 19th century - 緯度 幅插畫檔、美工圖案、卡通及圖標地圖, 南美, 比高犬
illustration of sun's rays reaching the earth, creating the greatest heat in the tropics and impinging at oblique angle towards the poles (solar heating) - 緯度 幅插畫檔、美工圖案、卡通及圖標地球, 太陽光線, 熱度 - 溫度