What makes a tropical place?

What is the depth of the Mississippi river in Memphis tn? What is the east coast? Are there any museums or places named after Charles Darwin? Where does the River Nidd end? What is the area code of Yellowstone National Park? How many national parks did John Muir make? What are the beautiful beaches in Hawaii? Does the climate of a coral reef effect the fish? Where is the National Sailing Hall Of Fame Museum in Annapolis Maryland located? Atolls are examples of? How are haversion canals connected to other? What does sea side mean? Why did farming not take place west of the Great Lakes? What is the name of the worlds largest canyon and where is it located? How big are Versailles grounds? How many rides are in elitch gardens? What is the cost of a Cantilever bridge? Which canal opens first the Panama or the Suez? What canal connects Lake Ontario with Lake Huron? What do wetland turtles eat?