What post does Gibraltar use?

What is the continent that the Hoover Dam is in? What is the area of Santa Cruz de Tenerife? Where is the Hobo Museum in Britt Iowa located? The duck may swim on the lake but your daddy owns the lake? What soil types are in the deciduous forest? Why should you save the oceans? Would a person have least amount of mass at sea level Mount Everest or the Moon? How hot is Joshua Tree national park? Can streams be man made? How many tourists a week go to Victoria Falls? What happened to the tip of the Great Pyramid of Giza? What are the 3 largest non arctic deserts in the world? Where is the Masonic Home Memorial Museum in Ft Worth Texas located? Who built the forth road bridge? Why are beef eaters called beef eaters? How much for 1975 national gallery Christmas stamp? What is the Water pressure at 50 meters beneath the sea? What wildlife is in mount snowdon? Why did shippers and manufactures hope to build ports on CA pacific coast? What are the sand dunes in Houston?