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Palm Beach Gardens 7.3 Invasive species Tourism is one of the Miami's largest private-sector industries accounting for more than 144,800 jobs in Miami-Dade County the city's frequent portrayal in music film and popular culture has made the city and its landmarks recognizable worldwide in 2016 it attracted the second-highest number of foreign tourists of any city in the United States after New York City and is among the top 20 cities worldwide by international visitor spending More than 15.9 million visitors arrived in Miami in 2017 adding US$26.1 billion to the economy With a large hotel infrastructure and the newly renovated Miami Beach Convention Center Miami is a popular destination for annual conventions and conferences. . The Safety Valve is a series of shallow sand flats separated by tidal flow channels stretching about 8 miles (13 km) from the south end of Key Biscayne to the Ragged Keys at the north end of the Florida Keys the term "safety valve" was applied to the tidal flats by Ralph Munroe who argued against building a causeway and bridges connecting Key Biscayne to the Ragged Keys and beyond on the grounds that such construction would block the free outflow of storm surges from the bay across the flats to the ocean It is believed that it does moderate the effects of storm surges on the bay the transportation of sand southward along the Atlantic Coast of Florida by longshore drift ends in the area of the Safety Valve the structure of the Safety Valve has been stable for at least the last century Stiltsville is a collection of buildings on pilings on several sand flats at the northern end of the Safety Valve, U.S National Register of Historic Places Roosevelt Gardens Miami Silver Service In 2003 the controversial Free Trade Area of the Americas negotiation occurred it was a proposed agreement to reduce trade barriers while increasing intellectual property rights During the 2003 meeting in Miami the Free Trade Area of the Americas was met by heavy opposition from anti-corporatization and anti-globalization protests.

; The geologic formations that have the most influence on the Everglades are the Miami Limestone and the Fort Thompson Formation the Miami Limestone has two facies the Miami Oolite facies which underlies the Atlantic Coastal Ridge from southern Palm Beach County to southern Miami-Dade County is made up of ooids: tiny formations of egg-shaped concentric shells and calcium carbonate formed around a single grain of sand or shell fragment the other facies which underlies the eastern lower Everglades (in Miami-Dade County and part of Monroe County) consists of fossilized bryozoan organisms the unique structure was some of the first material used in housing in early 20th-century South Florida the composition of this sedimentary formation affects the hydrology plant life and wildlife above it: the rock is especially porous and stores water during the dry season in the Everglades and its chemical composition determines the vegetation prevalent in the region the Miami Oolite facies also acts to impede flow of water from the Everglades to the ocean between Fort Lauderdale and Coot Bay (near Cape Sable). Aerial view of the Safety Valve from southern end of Key Biscayne (top) to Soldier Key, Miami Florida Business directory Everglades National Park School of Arts and Sciences (17.3) 67.7! . .