How many cultures are in Giza?

How long is the Katherine river? Which direction does the severn flow? What plants are in a grassland? What is the name of North America's largest mountain- its in Alaska? Where is the USS Hornet museum? What kind of bridge is the Henderson waves bridge? Where would you find water in the desert? Echolocation for mapping the bottom of the ocean? What was the collosseum used for? What renewable resource is there in a coniferous forest? Is the indus river east or west of the ganges river? How long is the pool in front of the Taj Mahal? How many tourists are there in the world? What is the driest month of the savanna? What method might be used to force a castle to surrender Europe? What is the ecosystem of the Sahara desert? Is Stonehenge ruins? How do breeding programs work? Is there any industries along the volga river? All the wonder of world?