Is art gallery a compound noun?

What are the resources of tropical rain fotest? When was the Bridgewater canal built? Is the Columbia River really 4000 feet deep? What happened to the spanish missions under Mexican rule? How far is montmartre from the eifel tower? What is the total length of all the streams in the basin divided by the total area of the basin? Who thought of the idea of constructing Notre Dame? Does Yellowstone National Park have waterfalls? What is the river po's length and depth? Is there any concentric castles still standing? Does a canyon have water? Where is the red door club in the rio grande valley? Who explored the Mississippi river in the late 1600? How did they bring back wolves to the Yellowstone Park? Are there any famous sights in New York or museums? What is the name of a bridge to carry water over a road or river? What is the elevation of a mountain? What is the narrative of the Three Sisters at the Monument Valley? Was mission san carlos borromeo de carmel ever damaged? What was the first castle to have a moat?