“So basically all of our sand is like a bunch of like small quartz particles,” said Peters. “And this came down from the Appalachian Mountains and the Apalachicola River about like 20,000 years ago.
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Most beaches contain quartz sand brought to the coast by rivers draining the Appalachian mountains. Many beaches also contain shells and shell fragments Florida's coastline spans over 1,260 miles.
Many of the Florida Keys' beaches are manmade, or are just a layer of sand over a sliver of limestone. The north is almost always cooler than south, something to remember in both summer and winter.
For millions of years in the Gulf of Mexico and along the coast the constant grinding and pulverizing motion of the waves have broken down the sand. That creates a situation where the sand becomes so fine it doesn't take more than a small breeze to displace it on the beach. This is called “saltating”.
The sand is made from pure white quartz crystal, which came from the Appalachian Mountains at the end of the last Ice Age and was deposited into the Gulf of Mexico.
In spite of the fact that most beachgoers are unaware that many Florida beaches are artificial, even more people do not realize that the barrier islands along the southeast Florida shore are man-made coastal features, much larger and more imposing than the beach itself.
A Man-Made Paradise UnfoldsYes, folks, you read it right! Aside from being one of the few man-made islands in the United States, Miami Beach used to be a mangrove swamp back in 1912, which the growers tried to make into a coconut plantation but had better luck producing an avocado grove.
Why does Florida beach sand squeak? Squeaking (sometimes called whistling) sand happens where sand is mostly quartz, very well rounded and highly spherical, according to Scientific American. The frequency and amplitude are related to the grain size and surface texture.
An array of crustaceans – including sand crabs, roly polies (isopods), and beach hoppers (amphipods) – as well as beetles, blood worms and clams, all move up and down the beach according to the water level. This on-the-go lifestyle makes management of this ecosystem a unique challenge (see Best Practices).
Though some beaches form on inland freshwater locations such as lakes and rivers, most beaches are in coastal areas where wave or current action deposits and reworks sediments. Erosion and changing of beach geologies happens through natural processes, like wave action and extreme weather events.
Florida is home to thriving marine life such as sea turtles, corals, manatees, mangroves, dolphins, whales, sharks, sawfish, rays, spiny lobsters, crabs and countless species of fish.