How did the great sand dunes get its name?

How is the Columbia river system a valuable resource that should be used to meet the needs of people? Is April a good time to go to Universal Studios Florida? What is the biggest threat to the cacti in the desert? When was the first wharf built? What are gobi desert houses made of? What is the address of the great lodge six flags in New York? Where is millennium park located? Why is ocean water more salty than average in warn and dry places? When does great basin national park open? How heavy is the golden menorah near the western wall? Where is the warm gulf stream current located? Does the Golden Gate Bridge count as a US monument? Which mountain in Alaska is taller than Mt Everest? Who are Mission San Gabriel's Claretian Priests? What seasons does the pacific ocean go through? What part of a river system is closest to the mouth of the river is? Why are the areas near the great lakes have so many cities? How have the Great lakes helped Ontario develop? Are there any large deserts in Europe? Are there sparrows in the tropical rainforest?