How deep is the Salton sea?

Where is the George Westinghouse Museum in Wilmerding Pennsylvania located? Topsoil that washes onto a coral reef? What is the difference between rain forest animals and regular forest animals? What highland park is most visited? What was the motte for in a castle? What is the nearest NJ shore point to Quakertown PA? When was the Ellis Island Immigration Station opened? What organization runs Alcatraz Island? What is tourism and recreation? Is the wall that surrounds the statue of liberty a cube? What is the length of the channel tunnel? What was the plan called to gain control of the Mississippi river? What oceans are Canada's borders to the east and west? What is monalisa holding in her left hand? What happend when people arrived at Ellis Island? What speed does an old river have? Why are people starting to farm the ocean instead of harvesting wild organisms? Does the acropolis still stand today? How many lighthouses does Ohio have? Why was it easier to travel by sea?