How were the florida keys formed

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How were the florida keys formed

  1. 1. How were the Florida Keys Formed?<br />What natural events caused the formation of the keys?<br />
  2. 2. The Ancient Coral Reef<br />About 2-3 million years ago during the Pleistocene Epoch large sand shoals appeared in the oceans.<br />What are shoals?<br />About 500 million years ago a large coral reef began to grow on these shoals, one in particular was around the location of Florida today.<br />
  3. 3. Climate Change<br />About 100,000 to 125,000 years ago the Earth’s temperature began to cool. <br />Ice caps began to form and expand over the North and South poles removing fresh water from the oceans.<br />The ocean level dropped by as much as 300-400 ft.<br />The coral reefs were exposed and died.<br />
  4. 4. More Climate Change!<br />About 26,000 years ago the Earth began to warm and the ice caps began to shrink, glaciers disappeared. <br />The oceans began to rise slowly again.<br />20,000 years later the oceans had risen back to nearly where they were, but some land areas were still exposed. Namely the Florida Keys!<br />
  5. 5. Map of the Change in Florida<br />
  6. 6. Questions<br />What are the Florida Keys made of? <br />The upper and middle keys which are generally larger and longer are made of limestone. The limestone is the remnants of the ancient coral reefs. <br />What are coral reefs? What is limestone?<br />The lower keys are made of oolite. <br />What is oolite?<br />

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